/*!
 * Handsontable 0.14.1
 * Handsontable is a JavaScript library for editable tables with basic copy-paste compatibility with Excel and Google Docs
 *
 * Copyright (c) 2012-2014 Marcin Warpechowski
 * Copyright (c) 2015 Handsoncode sp. z o.o. <hello@handsontable.com>
 * Licensed under the MIT license.
 * http://handsontable.com/
 *
 * Date: Wed Apr 08 2015 10:00:22 GMT+0200 (CEST)
 */
/*jslint white: true, browser: true, plusplus: true, indent: 4, maxerr: 50 */

//var Handsontable = { //class namespace
//  plugins: {}, //plugin namespace
//  helper: {} //helper namespace
//};

var Handsontable = function (rootElement, userSettings) {
  userSettings = userSettings || {};
  var instance = new Handsontable.Core(rootElement, userSettings);
  instance.init();
  return instance;
};
Handsontable.plugins = {};

(function (window, Handsontable) {
  "use strict";

//http://stackoverflow.com/questions/3629183/why-doesnt-indexof-work-on-an-array-ie8
  if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (elt /*, from*/) {
      var len = this.length >>> 0;

      var from = Number(arguments[1]) || 0;
      from = (from < 0)
          ? Math.ceil(from)
          : Math.floor(from);
      if (from < 0)
        from += len;

      for (; from < len; from++) {
        if (from in this &&
            this[from] === elt)
          return from;
      }
      return -1;
    };
  }
  /**
   * Array.filter() shim by Trevor Menagh (https://github.com/trevmex) with some modifications
   */

  if (!Array.prototype.filter) {
    Array.prototype.filter = function (fun, thisp) {
      "use strict";

      if (typeof this === "undefined" || this === null) {
        throw new TypeError();
      }
      if (typeof fun !== "function") {
        throw new TypeError();
      }

      thisp = thisp || this;

      if (isNodeList(thisp)) {
        thisp = convertNodeListToArray(thisp);
      }

      var len = thisp.length,
          res = [],
          i,
          val;

      for (i = 0; i < len; i += 1) {
        if (thisp.hasOwnProperty(i)) {
          val = thisp[i]; // in case fun mutates this
          if (fun.call(thisp, val, i, thisp)) {
            res.push(val);
          }
        }
      }

      return res;

      function isNodeList(object) {
        return /NodeList/i.test(object.item);
      }

      function convertNodeListToArray(nodeList) {
        var array = [];

        for (var i = 0, len = nodeList.length; i < len; i++){
          array[i] = nodeList[i]
        }

        return array;
      }
    };
  }

  if (!Array.isArray) {
    Array.isArray = function(obj) {
      return toString.call(obj) == '[object Array]';
    };
  }

// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
// License CC-BY-SA v2.5
  if (!Object.keys) {
    Object.keys = (function() {
      'use strict';
      var hasOwnProperty = Object.prototype.hasOwnProperty,
          hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'),
          dontEnums = [
            'toString',
            'toLocaleString',
            'valueOf',
            'hasOwnProperty',
            'isPrototypeOf',
            'propertyIsEnumerable',
            'constructor'
          ],
          dontEnumsLength = dontEnums.length;

      return function(obj) {
        if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) {
          throw new TypeError('Object.keys called on non-object');
        }

        var result = [], prop, i;

        for (prop in obj) {
          if (hasOwnProperty.call(obj, prop)) {
            result.push(prop);
          }
        }

        if (hasDontEnumBug) {
          for (i = 0; i < dontEnumsLength; i++) {
            if (hasOwnProperty.call(obj, dontEnums[i])) {
              result.push(dontEnums[i]);
            }
          }
        }
        return result;
      };
    }());
  }

  /*
   * Copyright 2012 The Polymer Authors. All rights reserved.
   * Use of this source code is governed by a BSD-style
   * license that can be found in the LICENSE file.
   */

  if (typeof WeakMap === 'undefined') {
    (function() {
      var defineProperty = Object.defineProperty;

      try {
        var properDefineProperty = true;
        defineProperty(function(){}, 'foo', {});
      } catch (e) {
        properDefineProperty = false;
      }

      /*
       IE8 does not support Date.now() but IE8 compatibility mode in IE9 and IE10 does.
       M$ deserves a high five for this one :)
       */
      var counter = +(new Date) % 1e9;

      var WeakMap = function() {
        this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
        if(!properDefineProperty){
          this._wmCache = [];
        }
      };

      if(properDefineProperty){
        WeakMap.prototype = {
          set: function(key, value) {
            var entry = key[this.name];
            if (entry && entry[0] === key)
              entry[1] = value;
            else
              defineProperty(key, this.name, {value: [key, value], writable: true});

          },
          get: function(key) {
            var entry;
            return (entry = key[this.name]) && entry[0] === key ?
                entry[1] : undefined;
          },
          'delete': function(key) {
            this.set(key, undefined);
          }
        };
      } else {
        WeakMap.prototype = {
          set: function(key, value) {

            if(typeof key == 'undefined' || typeof value == 'undefined') return;

            for(var i = 0, len = this._wmCache.length; i < len; i++){
              if(this._wmCache[i].key == key){
                this._wmCache[i].value = value;
                return;
              }
            }

            this._wmCache.push({key: key, value: value});

          },
          get: function(key) {

            if(typeof key == 'undefined') return;

            for(var i = 0, len = this._wmCache.length; i < len; i++){
              if(this._wmCache[i].key == key){
                return  this._wmCache[i].value;
              }
            }

            return;

          },
          'delete': function(key) {

            if(typeof key == 'undefined') return;

            for(var i = 0, len = this._wmCache.length; i < len; i++){
              if(this._wmCache[i].key == key){
                Array.prototype.slice.call(this._wmCache, i, 1);
              }
            }
          }
        };
      }

      window.WeakMap = WeakMap;
    })();
  }

  Handsontable.activeGuid = null;

  /**
   * @alias Handsontable.Core
   * @constructor
   * @description
   *
   * After Handsontable is constructed, you can modify the grid behavior using the available public methods.
   *
   * ---
   * ## How to call methods
   *
   * These are 2 equal ways to call a Handsontable method:
   *
   * @example
   * ```js
   * // all following examples assume that you constructed Handsontable like this
   * var exampleContainer1 = document.getElementById('example1');
   * var ht = new Handsontable(exampleContainer1, options);
   *
   * // now, to use setDataAtCell method, you can either:
   * ht.setDataAtCell(0, 0, 'new value');
   * ```
   *
   * Alternatively, you can call the method using jQuery wrapper (__obsolete__, requires initialization using our jQuery guide
   * @example
   * ```js
   *   $('#example1').handsontable('setDataAtCell', 0, 0, 'new value');
   * ```
   * ---
   */
  Handsontable.Core = function (rootElement, userSettings) {
    var priv
        , datamap
        , grid
        , selection
        , editorManager
        , instance = this
        , GridSettings = function () {}
        , eventManager = Handsontable.eventManager(instance);

    Handsontable.helper.extend(GridSettings.prototype, DefaultSettings.prototype); //create grid settings as a copy of default settings
    Handsontable.helper.extend(GridSettings.prototype, userSettings); //overwrite defaults with user settings
    Handsontable.helper.extend(GridSettings.prototype, expandType(userSettings));

    this.rootElement = rootElement;
    this.isHotTableEnv = Handsontable.Dom.isChildOfWebComponentTable(this.rootElement);
    Handsontable.eventManager.isHotTableEnv = this.isHotTableEnv;

    this.container = document.createElement('DIV');

    rootElement.insertBefore(this.container, rootElement.firstChild);

    this.guid = 'ht_' + Handsontable.helper.randomString(); //this is the namespace for global events

    if (!this.rootElement.id || this.rootElement.id.substring(0, 3) === "ht_") {
      this.rootElement.id = this.guid; //if root element does not have an id, assign a random id
    }
    priv = {
      cellSettings: [],
      columnSettings: [],
      columnsSettingConflicts: ['data', 'width'],
      settings: new GridSettings(), // current settings instance
      selRange: null, //exposed by public method `getSelectedRange`
      isPopulated: null,
      scrollable: null,
      firstRun: true
    };

    grid = {
      /**
       * Inserts or removes rows and columns
       *
       * @param {String} action Possible values: "insert_row", "insert_col", "remove_row", "remove_col"
       * @param {Number} index
       * @param {Number} amount
       * @param {String} [source] Optional. Source of hook runner.
       * @param {Boolean} [keepEmptyRows] Optional. Flag for preventing deletion of empty rows.
       */
      alter: function (action, index, amount, source, keepEmptyRows) {
        var delta;

        amount = amount || 1;

        switch (action) {
          case "insert_row":
            delta = datamap.createRow(index, amount);

            if (delta) {
              if (selection.isSelected() && priv.selRange.from.row >= index) {
                priv.selRange.from.row = priv.selRange.from.row + delta;
                selection.transformEnd(delta, 0); //will call render() internally
              }
              else {
                selection.refreshBorders(); //it will call render and prepare methods
              }
            }
            break;

          case "insert_col":
            // //column order may have changes, so we need to translate the selection column index -> source array index
            // index = instance.runHooksAndReturn('modifyCol', index);
            delta = datamap.createCol(index, amount);

            if (delta) {

              if(Array.isArray(instance.getSettings().colHeaders)){
                var spliceArray = [index, 0];
                spliceArray.length += delta; //inserts empty (undefined) elements at the end of an array
                Array.prototype.splice.apply(instance.getSettings().colHeaders, spliceArray); //inserts empty (undefined) elements into the colHeader array
              }

              if (selection.isSelected() && priv.selRange.from.col >= index) {
                priv.selRange.from.col = priv.selRange.from.col + delta;
                selection.transformEnd(0, delta); //will call render() internally
              }
              else {
                selection.refreshBorders(); //it will call render and prepare methods
              }
            }
            break;

          case "remove_row":
            //column order may have changes, so we need to translate the selection column index -> source array index
            index = instance.runHooks('modifyCol', index);

            datamap.removeRow(index, amount);
            priv.cellSettings.splice(index, amount);

            var fixedRowsTop = instance.getSettings().fixedRowsTop;
            if (fixedRowsTop >= index + 1) {
              instance.getSettings().fixedRowsTop -= Math.min(amount, fixedRowsTop - index);
            }

            grid.adjustRowsAndCols();
            selection.refreshBorders(); //it will call render and prepare methods
            break;

          case "remove_col":
            datamap.removeCol(index, amount);

            for(var row = 0, len = datamap.getAll().length; row < len; row++){
              if(row in priv.cellSettings){  //if row hasn't been rendered it wouldn't have cellSettings
                priv.cellSettings[row].splice(index, amount);
              }
            }

            var fixedColumnsLeft = instance.getSettings().fixedColumnsLeft;
            if (fixedColumnsLeft >= index + 1) {
              instance.getSettings().fixedColumnsLeft -= Math.min(amount, fixedColumnsLeft - index);
            }

            if(Array.isArray(instance.getSettings().colHeaders)){
              if(typeof index == 'undefined'){
                index = -1;
              }
              instance.getSettings().colHeaders.splice(index, amount);
            }

            //priv.columnSettings.splice(index, amount);

            grid.adjustRowsAndCols();
            selection.refreshBorders(); //it will call render and prepare methods
            break;

          /* jshint ignore:start */
          default:
            throw new Error('There is no such action "' + action + '"');
            break;
          /* jshint ignore:end */
        }

        if (!keepEmptyRows) {
          grid.adjustRowsAndCols(); //makes sure that we did not add rows that will be removed in next refresh
        }
      },

      /**
       * Makes sure there are empty rows at the bottom of the table
       */
      adjustRowsAndCols: function () {
        var r, rlen, emptyRows, emptyCols;

        //should I add empty rows to data source to meet minRows?
        rlen = instance.countRows();
        if (rlen < priv.settings.minRows) {
          for (r = 0; r < priv.settings.minRows - rlen; r++) {
            datamap.createRow(instance.countRows(), 1, true);
          }
        }

        emptyRows = instance.countEmptyRows(true);

        //should I add empty rows to meet minSpareRows?
        if (emptyRows < priv.settings.minSpareRows) {
          for (; emptyRows < priv.settings.minSpareRows && instance.countRows() < priv.settings.maxRows; emptyRows++) {
            datamap.createRow(instance.countRows(), 1, true);
          }
        }

        //count currently empty cols
        emptyCols = instance.countEmptyCols(true);

        //should I add empty cols to meet minCols?
        if (!priv.settings.columns && instance.countCols() < priv.settings.minCols) {
          for (; instance.countCols() < priv.settings.minCols; emptyCols++) {
            datamap.createCol(instance.countCols(), 1, true);
          }
        }

        //should I add empty cols to meet minSpareCols?
        if (!priv.settings.columns && instance.dataType === 'array' && emptyCols < priv.settings.minSpareCols) {
          for (; emptyCols < priv.settings.minSpareCols && instance.countCols() < priv.settings.maxCols; emptyCols++) {
            datamap.createCol(instance.countCols(), 1, true);
          }
        }

        // if (priv.settings.enterBeginsEditing) {
        //   for (; (((priv.settings.minRows || priv.settings.minSpareRows) &&
        //        instance.countRows() > priv.settings.minRows) && (priv.settings.minSpareRows && emptyRows > priv.settings.minSpareRows)); emptyRows--) {
        //     datamap.removeRow();
        //   }
        // }

        // if (priv.settings.enterBeginsEditing && !priv.settings.columns) {
        //   for (; (((priv.settings.minCols || priv.settings.minSpareCols) &&
        //        instance.countCols() > priv.settings.minCols) && (priv.settings.minSpareCols && emptyCols > priv.settings.minSpareCols)); emptyCols--) {
        //     datamap.removeCol();
        //   }
        // }

        var rowCount = instance.countRows();
        var colCount = instance.countCols();

        if (rowCount === 0 || colCount === 0) {
          selection.deselect();
        }

        if (selection.isSelected()) {
          var selectionChanged;
          var fromRow = priv.selRange.from.row;
          var fromCol = priv.selRange.from.col;
          var toRow = priv.selRange.to.row;
          var toCol = priv.selRange.to.col;

          //if selection is outside, move selection to last row
          if (fromRow > rowCount - 1) {
            fromRow = rowCount - 1;
            selectionChanged = true;
            if (toRow > fromRow) {
              toRow = fromRow;
            }
          } else if (toRow > rowCount - 1) {
            toRow = rowCount - 1;
            selectionChanged = true;
            if (fromRow > toRow) {
              fromRow = toRow;
            }
          }

          //if selection is outside, move selection to last row
          if (fromCol > colCount - 1) {
            fromCol = colCount - 1;
            selectionChanged = true;
            if (toCol > fromCol) {
              toCol = fromCol;
            }
          } else if (toCol > colCount - 1) {
            toCol = colCount - 1;
            selectionChanged = true;
            if (fromCol > toCol) {
              fromCol = toCol;
            }
          }

          if (selectionChanged) {
            instance.selectCell(fromRow, fromCol, toRow, toCol);
          }
        }
      },

      /**
       * Populate cells at position with 2d array
       *
       * @param {Object} start Start selection position
       * @param {Array} input 2d array
       * @param {Object} [end] End selection position (only for drag-down mode)
       * @param {String} [source="populateFromArray"]
       * @param {String} [method="overwrite"]
       * @param {String} direction (left|right|up|down)
       * @param {Array} deltas array
       * @returns {Object|undefined} ending td in pasted area (only if any cell was changed)
       */
      populateFromArray: function (start, input, end, source, method, direction, deltas) {
        var r, rlen, c, clen, setData = [], current = {};
        rlen = input.length;
        if (rlen === 0) {
          return false;
        }

        var repeatCol
            , repeatRow
            , cmax
            , rmax;

        // insert data with specified pasteMode method
        switch (method) {
          case 'shift_down' :
            repeatCol = end ? end.col - start.col + 1 : 0;
            repeatRow = end ? end.row - start.row + 1 : 0;
            input = Handsontable.helper.translateRowsToColumns(input);
            for (c = 0, clen = input.length, cmax = Math.max(clen, repeatCol); c < cmax; c++) {
              if (c < clen) {
                for (r = 0, rlen = input[c].length; r < repeatRow - rlen; r++) {
                  input[c].push(input[c][r % rlen]);
                }
                input[c].unshift(start.col + c, start.row, 0);
                instance.spliceCol.apply(instance, input[c]);
              }
              else {
                input[c % clen][0] = start.col + c;
                instance.spliceCol.apply(instance, input[c % clen]);
              }
            }
            break;

          case 'shift_right' :
            repeatCol = end ? end.col - start.col + 1 : 0;
            repeatRow = end ? end.row - start.row + 1 : 0;
            for (r = 0, rlen = input.length, rmax = Math.max(rlen, repeatRow); r < rmax; r++) {
              if (r < rlen) {
                for (c = 0, clen = input[r].length; c < repeatCol - clen; c++) {
                  input[r].push(input[r][c % clen]);
                }
                input[r].unshift(start.row + r, start.col, 0);
                instance.spliceRow.apply(instance, input[r]);
              }
              else {
                input[r % rlen][0] = start.row + r;
                instance.spliceRow.apply(instance, input[r % rlen]);
              }
            }
            break;

          /* jshint ignore:start */
          case 'overwrite':
          default:
            /* jshint ignore:end */
            // overwrite and other not specified options
            current.row = start.row;
            current.col = start.col;

            var iterators = {row: 0, col: 0}, // number of packages
                selected = { // selected range
                  row: (end && start) ? (end.row - start.row + 1) : 1,
                  col: (end && start) ? (end.col - start.col + 1) : 1
                };

            if (['up', 'left'].indexOf(direction) !== -1) {
              iterators = {
                row: Math.ceil(selected.row / rlen) || 1,
                col: Math.ceil(selected.col / input[0].length) || 1
              };
            } else if (['down', 'right'].indexOf(direction) !== -1) {
              iterators = {
                row: 1,
                col: 1
              };
            }


            for (r = 0; r < rlen; r++) {
              if ((end && current.row > end.row) || (!priv.settings.allowInsertRow && current.row > instance.countRows() - 1) || (current.row >= priv.settings.maxRows)) {
                break;
              }
              current.col = start.col;
              clen = input[r] ? input[r].length : 0;
              for (c = 0; c < clen; c++) {
                if ((end && current.col > end.col) || (!priv.settings.allowInsertColumn && current.col > instance.countCols() - 1) || (current.col >= priv.settings.maxCols)) {
                  break;
                }

                if (!instance.getCellMeta(current.row, current.col).readOnly) {
                  var result,
                      value = input[r][c],
                      index = {
                        row: r,
                        col: c
                      };

                  if (source === 'autofill') {
                    result = instance.runHooks('beforeAutofillInsidePopulate', index, direction, input, deltas, iterators, selected);

                    if (result) {
                      iterators = typeof(result.iterators) !== 'undefined' ? result.iterators : iterators;
                      value = typeof(result.value) !== 'undefined' ? result.value : value;
                    }
                  }
                  if (Array.isArray(value) || Handsontable.helper.isObject(value)) {
                    value = Handsontable.helper.deepClone(value);
                  }
                  setData.push([current.row, current.col, value]);
                }

                current.col++;

                if (end && c === clen - 1) {
                  c = -1;

                  if (['down', 'right'].indexOf(direction) !== -1) {
                    iterators.col++;
                  } else if (['up', 'left'].indexOf(direction) !== -1) {
                    if (iterators.col > 1) {
                      iterators.col--;
                    }
                  }

                }
              }

              current.row++;
              iterators.col = 1;

              if (end && r === rlen - 1) {
                r = -1;

                if (['down', 'right'].indexOf(direction) !== -1) {
                  iterators.row++;
                } else if (['up', 'left'].indexOf(direction) !== -1) {
                  if (iterators.row > 1) {
                    iterators.row--;
                  }
                }

              }
            }
            instance.setDataAtCell(setData, null, null, source || 'populateFromArray');
            break;
        }
      }
    };

    this.selection = selection = { //this public assignment is only temporary
      inProgress: false,

      selectedHeader: {
        cols: false,
        rows: false
      },

      /**
       * @param {Number} rows
       * @param {Number} cols
       */
      setSelectedHeaders: function (rows, cols) {
        instance.selection.selectedHeader.rows = rows;
        instance.selection.selectedHeader.cols = cols;
      },

      /**
       * Sets inProgress to `true`. This enables onSelectionEnd and onSelectionEndByProp to function as desired.
       */
      begin: function () {
        instance.selection.inProgress = true;
      },

      /**
       * Sets inProgress to `false`. Triggers onSelectionEnd and onSelectionEndByProp.
       */
      finish: function () {
        var sel = instance.getSelected();
        Handsontable.hooks.run(instance, "afterSelectionEnd", sel[0], sel[1], sel[2], sel[3]);
        Handsontable.hooks.run(instance, "afterSelectionEndByProp", sel[0], instance.colToProp(sel[1]), sel[2], instance.colToProp(sel[3]));
        instance.selection.inProgress = false;
      },

      /**
       * @returns {Boolean}
       */
      isInProgress: function () {
        return instance.selection.inProgress;
      },

      /**
       * Starts selection range on given td object.
       *
       * @param {WalkontableCellCoords} coords
       * @param keepEditorOpened
       */
      setRangeStart: function (coords, keepEditorOpened) {
        Handsontable.hooks.run(instance, "beforeSetRangeStart", coords);
        priv.selRange = new WalkontableCellRange(coords, coords, coords);
        selection.setRangeEnd(coords, null, keepEditorOpened);
      },

      /**
       * Ends selection range on given td object.
       *
       * @param {WalkontableCellCoords} coords
       * @param {Boolean} [scrollToCell=true] If `true`, viewport will be scrolled to range end
       * @param {Boolean} [keepEditorOpened] If `true`, cell editor will be still opened after changing selection range
       */
      setRangeEnd: function (coords, scrollToCell, keepEditorOpened) {
        if (priv.selRange === null) {
          return;
        }
        var disableVisualSelection;

        //trigger handlers
        Handsontable.hooks.run(instance, "beforeSetRangeEnd", coords);
        instance.selection.begin();
        priv.selRange.to = new WalkontableCellCoords(coords.row, coords.col);

        if (!priv.settings.multiSelect) {
          priv.selRange.from = coords;
        }
        // set up current selection
        instance.view.wt.selections.current.clear();

        disableVisualSelection = instance.getCellMeta(priv.selRange.highlight.row, priv.selRange.highlight.col).disableVisualSelection;

        if (typeof disableVisualSelection === 'string') {
          disableVisualSelection = [disableVisualSelection];
        }

        if (disableVisualSelection === false ||
            Array.isArray(disableVisualSelection) && disableVisualSelection.indexOf('current') === -1) {
          instance.view.wt.selections.current.add(priv.selRange.highlight);
        }
        // set up area selection
        instance.view.wt.selections.area.clear();

        if ((disableVisualSelection === false ||
            Array.isArray(disableVisualSelection) && disableVisualSelection.indexOf('area') === -1) &&
            selection.isMultiple()) {
          instance.view.wt.selections.area.add(priv.selRange.from);
          instance.view.wt.selections.area.add(priv.selRange.to);
        }
        // set up highlight
        if (priv.settings.currentRowClassName || priv.settings.currentColClassName) {
          instance.view.wt.selections.highlight.clear();
          instance.view.wt.selections.highlight.add(priv.selRange.from);
          instance.view.wt.selections.highlight.add(priv.selRange.to);
        }

        // trigger handlers
        Handsontable.hooks.run(instance, "afterSelection",
            priv.selRange.from.row, priv.selRange.from.col, priv.selRange.to.row, priv.selRange.to.col);
        Handsontable.hooks.run(instance, "afterSelectionByProp",
            priv.selRange.from.row, datamap.colToProp(priv.selRange.from.col), priv.selRange.to.row, datamap.colToProp(priv.selRange.to.col));

        if (scrollToCell !== false && instance.view.mainViewIsActive()) {
          if (priv.selRange.from && !selection.isMultiple()) {
            instance.view.scrollViewport(priv.selRange.from);
          } else {
            instance.view.scrollViewport(coords);
          }
        }
        selection.refreshBorders(null, keepEditorOpened);
      },

      /**
       * Destroys editor, redraws borders around cells, prepares editor.
       *
       * @param {Boolean} [revertOriginal]
       * @param {Boolean} [keepEditor]
       */
      refreshBorders: function (revertOriginal, keepEditor) {
        if (!keepEditor) {
          editorManager.destroyEditor(revertOriginal);
        }
        instance.view.render();
        if (selection.isSelected() && !keepEditor) {
          editorManager.prepareEditor();
        }
      },

      /**
       * Returns information if we have a multiselection.
       *
       * @returns {Boolean}
       */
      isMultiple: function () {
        var isMultiple = !(priv.selRange.to.col === priv.selRange.from.col && priv.selRange.to.row === priv.selRange.from.row)
            , modifier = Handsontable.hooks.run(instance, 'afterIsMultipleSelection', isMultiple);

        if(isMultiple) {
          return modifier;
        }
      },

      /**
       * Selects cell relative to current cell (if possible).
       */
      transformStart: function (rowDelta, colDelta, force, keepEditorOpened) {
        var delta = new WalkontableCellCoords(rowDelta, colDelta);
        instance.runHooks('modifyTransformStart', delta);

        /* jshint ignore:start */
        if (priv.selRange.highlight.row + rowDelta > instance.countRows() - 1) {
          if (force && priv.settings.minSpareRows > 0) {
            instance.alter("insert_row", instance.countRows());
          }
          else if (priv.settings.autoWrapCol) {
            delta.row = 1 - instance.countRows();
            delta.col = priv.selRange.highlight.col + delta.col == instance.countCols() - 1 ? 1 - instance.countCols() : 1;
          }
        }
        else if (priv.settings.autoWrapCol && priv.selRange.highlight.row + delta.row < 0 && priv.selRange.highlight.col + delta.col >= 0) {
          delta.row = instance.countRows() - 1;
          delta.col = priv.selRange.highlight.col + delta.col == 0 ? instance.countCols() - 1 : -1;
        }

        if (priv.selRange.highlight.col + delta.col > instance.countCols() - 1) {
          if (force && priv.settings.minSpareCols > 0) {
            instance.alter("insert_col", instance.countCols());
          }
          else if (priv.settings.autoWrapRow) {
            delta.row = priv.selRange.highlight.row + delta.row == instance.countRows() - 1 ? 1 - instance.countRows() : 1;
            delta.col = 1 - instance.countCols();
          }
        }
        else if (priv.settings.autoWrapRow && priv.selRange.highlight.col + delta.col < 0 && priv.selRange.highlight.row + delta.row >= 0) {
          delta.row = priv.selRange.highlight.row + delta.row == 0 ? instance.countRows() - 1 : -1;
          delta.col = instance.countCols() - 1;
        }
        /* jshint ignore:end */

        var totalRows = instance.countRows();
        var totalCols = instance.countCols();
        var coords = new WalkontableCellCoords(priv.selRange.highlight.row + delta.row, priv.selRange.highlight.col + delta.col);

        if (coords.row < 0) {
          coords.row = 0;
        }
        else if (coords.row > 0 && coords.row >= totalRows) {
          coords.row = totalRows - 1;
        }

        if (coords.col < 0) {
          coords.col = 0;
        }
        else if (coords.col > 0 && coords.col >= totalCols) {
          coords.col = totalCols - 1;
        }

        selection.setRangeStart(coords, keepEditorOpened);
      },

      /**
       * Sets selection end cell relative to current selection end cell (if possible).
       */
      transformEnd: function (rowDelta, colDelta) {
        var delta = new WalkontableCellCoords(rowDelta, colDelta);
        instance.runHooks('modifyTransformEnd', delta);

        var totalRows = instance.countRows();
        var totalCols = instance.countCols();
        var coords = new WalkontableCellCoords(priv.selRange.to.row + delta.row, priv.selRange.to.col + delta.col);

        if (coords.row < 0) {
          coords.row = 0;
        }
        else if (coords.row > 0 && coords.row >= totalRows) {
          coords.row = totalRows - 1;
        }

        if (coords.col < 0) {
          coords.col = 0;
        }
        else if (coords.col > 0 && coords.col >= totalCols) {
          coords.col = totalCols - 1;
        }

        selection.setRangeEnd(coords, true);
      },

      /**
       * Returns `true` if currently there is a selection on screen, `false` otherwise.
       *
       * @returns {Boolean}
       */
      isSelected: function () {
        return (priv.selRange !== null);
      },

      /**
       * Returns `true` if coords is within current selection coords.
       *
       * @param {WalkontableCellCoords} coords
       * @returns {Boolean}
       */
      inInSelection: function (coords) {
        if (!selection.isSelected()) {
          return false;
        }
        return priv.selRange.includes(coords);
      },

      /**
       * Deselects all selected cells
       */
      deselect: function () {
        if (!selection.isSelected()) {
          return;
        }
        instance.selection.inProgress = false; //needed by HT inception
        priv.selRange = null;
        instance.view.wt.selections.current.clear();
        instance.view.wt.selections.area.clear();
        if (priv.settings.currentRowClassName || priv.settings.currentColClassName) {
          instance.view.wt.selections.highlight.clear();
        }
        editorManager.destroyEditor();
        selection.refreshBorders();
        Handsontable.hooks.run(instance, 'afterDeselect');
      },

      /**
       * Select all cells
       */
      selectAll: function () {
        if (!priv.settings.multiSelect) {
          return;
        }
        selection.setRangeStart(new WalkontableCellCoords(0, 0));
        selection.setRangeEnd(new WalkontableCellCoords(instance.countRows() - 1, instance.countCols() - 1), false);
      },

      /**
       * Deletes data from selected cells
       */
      empty: function () {
        if (!selection.isSelected()) {
          return;
        }
        var topLeft = priv.selRange.getTopLeftCorner();
        var bottomRight = priv.selRange.getBottomRightCorner();
        var r, c, changes = [];
        for (r = topLeft.row; r <= bottomRight.row; r++) {
          for (c = topLeft.col; c <= bottomRight.col; c++) {
            if (!instance.getCellMeta(r, c).readOnly) {
              changes.push([r, c, '']);
            }
          }
        }
        instance.setDataAtCell(changes);
      }
    };

    this.init = function () {
      Handsontable.hooks.run(instance, 'beforeInit');

      if(Handsontable.mobileBrowser) {
        Handsontable.Dom.addClass(instance.rootElement, 'mobile');
      }

      this.updateSettings(priv.settings, true);

      this.view = new Handsontable.TableView(this);
      editorManager = new Handsontable.EditorManager(instance, priv, selection, datamap);

      this.forceFullRender = true; //used when data was changed
      this.view.render();

      if (typeof priv.firstRun === 'object') {
        Handsontable.hooks.run(instance, 'afterChange', priv.firstRun[0], priv.firstRun[1]);
        priv.firstRun = false;
      }
      Handsontable.hooks.run(instance, 'afterInit');
    };

    function ValidatorsQueue() { //moved this one level up so it can be used in any function here. Probably this should be moved to a separate file
      var resolved = false;

      return {
        validatorsInQueue: 0,
        addValidatorToQueue: function () {
          this.validatorsInQueue++;
          resolved = false;
        },
        removeValidatorFormQueue: function () {
          this.validatorsInQueue = this.validatorsInQueue - 1 < 0 ? 0 : this.validatorsInQueue - 1;
          this.checkIfQueueIsEmpty();
        },
        onQueueEmpty: function () {
        },
        checkIfQueueIsEmpty: function () {
          /* jshint ignore:start */
          if (this.validatorsInQueue == 0 && resolved == false) {
            resolved = true;
            this.onQueueEmpty();
          }
          /* jshint ignore:end */
        }
      };
    }

    function validateChanges(changes, source, callback) {
      var waitingForValidator = new ValidatorsQueue();
      waitingForValidator.onQueueEmpty = resolve;

      for (var i = changes.length - 1; i >= 0; i--) {
        if (changes[i] === null) {
          changes.splice(i, 1);
        }
        else {
          var row = changes[i][0];
          var col = datamap.propToCol(changes[i][1]);
          // column order may have changes, so we need to translate physical col index (stored in datasource) to logical (displayed to user)
          var logicalCol = instance.runHooks('modifyCol', col);
          var cellProperties = instance.getCellMeta(row, logicalCol);

          if (cellProperties.type === 'numeric' && typeof changes[i][3] === 'string') {
            if (changes[i][3].length > 0 && (/^-?[\d\s]*(\.|\,)?\d*$/.test(changes[i][3]) || cellProperties.format )) {
              var len = changes[i][3].length;
              if (typeof cellProperties.language == 'undefined') {
                numeral.language('en');
              }
              // this input in format XXXX.XX is likely to come from paste. Let's parse it using international rules
              else if (changes[i][3].indexOf(".") === len - 3 && changes[i][3].indexOf(",") === -1) {
                numeral.language('en');
              }
              else {
                numeral.language(cellProperties.language);
              }
              if (numeral.validate(changes[i][3])) {
                changes[i][3] = numeral().unformat(changes[i][3]);
              }
            }
          }

          /* jshint ignore:start */
          if (instance.getCellValidator(cellProperties)) {
            waitingForValidator.addValidatorToQueue();
            instance.validateCell(changes[i][3], cellProperties, (function (i, cellProperties) {
                  return function (result) {
                    if (typeof result !== 'boolean') {
                      throw new Error("Validation error: result is not boolean");
                    }
                    if (result === false && cellProperties.allowInvalid === false) {
                      changes.splice(i, 1);         // cancel the change
                      cellProperties.valid = true;  // we cancelled the change, so cell value is still valid
                      --i;
                    }
                    waitingForValidator.removeValidatorFormQueue();
                  };
                })(i, cellProperties)
                , source);
          }
          /* jshint ignore:end */
        }
      }
      waitingForValidator.checkIfQueueIsEmpty();

      function resolve() {
        var beforeChangeResult;

        if (changes.length) {
          beforeChangeResult = Handsontable.hooks.run(instance, "beforeChange", changes, source);
          if (typeof beforeChangeResult === 'function') {
            console.warn("Your beforeChange callback returns a function. It's not supported since Handsontable 0.12.1 (and the returned function will not be executed).");
          } else if (beforeChangeResult === false) {
            changes.splice(0, changes.length); //invalidate all changes (remove everything from array)
          }
        }
        callback(); //called when async validators are resolved and beforeChange was not async
      }
    }

    /**
     * Internal function to apply changes. Called after validateChanges
     *
     * @private
     * @param {Array} changes Array in form of [row, prop, oldValue, newValue]
     * @param {String} source String that identifies how this change will be described in changes array (useful in onChange callback)
     */
    function applyChanges(changes, source) {
      var i = changes.length - 1;

      if (i < 0) {
        return;
      }

      for (; 0 <= i; i--) {
        if (changes[i] === null) {
          changes.splice(i, 1);
          continue;
        }

        if(changes[i][2] == null && changes[i][3] == null) {
          continue;
        }

        if (priv.settings.allowInsertRow) {
          while (changes[i][0] > instance.countRows() - 1) {
            datamap.createRow();
          }
        }

        if (instance.dataType === 'array' && priv.settings.allowInsertColumn) {
          while (datamap.propToCol(changes[i][1]) > instance.countCols() - 1) {
            datamap.createCol();
          }
        }

        datamap.set(changes[i][0], changes[i][1], changes[i][3]);
      }

      instance.forceFullRender = true; //used when data was changed
      grid.adjustRowsAndCols();
      Handsontable.hooks.run(instance, 'beforeChangeRender', changes, source);
      selection.refreshBorders(null, true);
      Handsontable.hooks.run(instance, 'afterChange', changes, source || 'edit');
    }

    this.validateCell = function (value, cellProperties, callback, source) {
      var validator = instance.getCellValidator(cellProperties);

      function done(valid) {
        var col = cellProperties.col,
            row = cellProperties.row,
            td = instance.getCell(row, col, true);

        if (td) {
          instance.view.wt.wtSettings.settings.cellRenderer(row, col, td);
        }
        callback(valid);
      }

      if (Object.prototype.toString.call(validator) === '[object RegExp]') {
        validator = (function (validator) {
          return function (value, callback) {
            callback(validator.test(value));
          };
        })(validator);
      }

      if (typeof validator == 'function') {

        value = Handsontable.hooks.run(instance, "beforeValidate", value, cellProperties.row, cellProperties.prop, source);

        // To provide consistent behaviour, validation should be always asynchronous
        instance._registerTimeout(setTimeout(function () {
          validator.call(cellProperties, value, function (valid) {
            valid = Handsontable.hooks.run(instance, "afterValidate", valid, value, cellProperties.row, cellProperties.prop, source);
            cellProperties.valid = valid;

            done(valid);
            Handsontable.hooks.run(instance, "postAfterValidate", valid, value, cellProperties.row, cellProperties.prop, source);
          });
        }, 0));

      } else {
        //resolve callback even if validator function was not found
        cellProperties.valid = true;
        done(cellProperties.valid);
      }
    };

    function setDataInputToArray(row, propOrCol, value) {
      if (typeof row === "object") { //is it an array of changes
        return row;
      }
      else {
        return [
          [row, propOrCol, value]
        ];
      }
    }

    /**
     * @description
     * Set new value to a cell. To change many cells at once, pass an array of `changes` in format `[[row, col, value], ...]` as
     * the only parameter. `col` is the index of __visible__ column (note that if columns were reordered,
     * the current order will be used). `source` is a flag for before/afterChange events. If you pass only array of
     * changes then `source` could be set as second parameter.
     *
     * @param {Number|Array} row or array of changes in format `[[row, col, value], ...]`
     * @param {Number|String} col or source String
     * @param {String} value
     * @param {String} [source] String that identifies how this change will be described in changes array (useful in onChange callback)
     */
    this.setDataAtCell = function (row, col, value, source) {
      var input = setDataInputToArray(row, col, value)
          , i
          , ilen
          , changes = []
          , prop;

      for (i = 0, ilen = input.length; i < ilen; i++) {
        if (typeof input[i] !== 'object') {
          throw new Error('Method `setDataAtCell` accepts row number or changes array of arrays as its first parameter');
        }
        if (typeof input[i][1] !== 'number') {
          throw new Error('Method `setDataAtCell` accepts row and column number as its parameters. If you want to use object property name, use method `setDataAtRowProp`');
        }
        prop = datamap.colToProp(input[i][1]);
        changes.push([
          input[i][0],
          prop,
          datamap.get(input[i][0], prop),
          input[i][2]
        ]);
      }

      if (!source && typeof row === "object") {
        source = col;
      }

      validateChanges(changes, source, function () {
        applyChanges(changes, source);
      });
    };


    /**
     * Same as above, except instead of `col`, you provide name of the object property (e.g. `[0, 'first.name', 'Jennifer']`).
     *
     * @param {Number|Array} row or array of changes in format `[[row, prop, value], ...]`
     * @param {String} prop or source String
     * @param {String} value
     * @param {String} [source] String that identifies how this change will be described in changes array (useful in onChange callback)
     */
    this.setDataAtRowProp = function (row, prop, value, source) {
      var input = setDataInputToArray(row, prop, value)
          , i
          , ilen
          , changes = [];

      for (i = 0, ilen = input.length; i < ilen; i++) {
        changes.push([
          input[i][0],
          input[i][1],
          datamap.get(input[i][0], input[i][1]),
          input[i][2]
        ]);
      }

      if (!source && typeof row === "object") {
        source = prop;
      }

      validateChanges(changes, source, function () {
        applyChanges(changes, source);
      });
    };

    /**
     * Listen to keyboard input on document body.
     *
     * @since 0.11
     */
    this.listen = function () {
      Handsontable.activeGuid = instance.guid;

      if (document.activeElement && document.activeElement !== document.body) {
        document.activeElement.blur();
      }
      else if (!document.activeElement) { //IE
        document.body.focus();
      }
    };

    /**
     * Stop listening to keyboard input on document body.
     *
     * @since 0.11
     */
    this.unlisten = function () {
      Handsontable.activeGuid = null;
    };

    /**
     * Returns `true` if current Handsontable instance is listening to keyboard input on document body.
     *
     * @since 0.11
     * @returns {Boolean}
     */
    this.isListening = function () {
      return Handsontable.activeGuid === instance.guid;
    };

    /**
     * Destroys current editor, renders and selects current cell.
     *
     * @param {Boolean} [revertOriginal] If != `true`, edited data is saved. Otherwise previous value is restored
     */
    this.destroyEditor = function (revertOriginal) {
      selection.refreshBorders(revertOriginal);
    };

    /**
     * Populate cells at position with 2D input array (e.g. `[[1, 2], [3, 4]]`).
     * Use `endRow`, `endCol` when you want to cut input when certain row is reached.
     * Optional `source` parameter (default value "populateFromArray") is used to identify this call in the resulting events (beforeChange, afterChange).
     * Optional `populateMethod` parameter (default value "overwrite", possible values "shift_down" and "shift_right")
     * has the same effect as pasteMethod option (see Options page)
     *
     * @since 0.9.0
     * @param {Number} row Start row
     * @param {Number} col Start column
     * @param {Array} input 2d array
     * @param {Number} [endRow] End row (use when you want to cut input when certain row is reached)
     * @param {Number} [endCol] End column (use when you want to cut input when certain column is reached)
     * @param {String} [source="populateFromArray"]
     * @param {String} [method="overwrite"]
     * @param {String} direction edit (left|right|up|down)
     * @param {Array} deltas array
     * @returns {Object|undefined} ending td in pasted area (only if any cell was changed)
     */
    this.populateFromArray = function (row, col, input, endRow, endCol, source, method, direction, deltas) {
      var c;

      if (!(typeof input === 'object' && typeof input[0] === 'object')) {
        throw new Error("populateFromArray parameter `input` must be an array of arrays"); //API changed in 0.9-beta2, let's check if you use it correctly
      }
      c = typeof endRow === 'number' ? new WalkontableCellCoords(endRow, endCol) : null;

      return grid.populateFromArray(new WalkontableCellCoords(row, col), input, c, source, method, direction, deltas);
    };

    /**
     * Adds/removes data from the column. This function works is modelled after Array.splice.
     * Parameter `col` is the index of column in which do you want to do splice.
     * Parameter `index` is the row index at which to start changing the array.
     * If negative, will begin that many elements from the end. Parameter `amount`, is the number of old array elements to remove.
     * If the amount is 0, no elements are removed. Fourth and further parameters are the `elements` to add to the array.
     * If you don't specify any elements, spliceCol simply removes elements from the array.
     * {@link Handsontable.DataMap#spliceCol}
     *
     * @since 0.9-beta2
     * @param {Number} col Index of column in which do you want to do splice.
     * @param {Number} index Index at which to start changing the array. If negative, will begin that many elements from the end
     * @param {Number} amount An integer indicating the number of old array elements to remove. If amount is 0, no elements are removed
     * @param {*} [elements] The elements to add to the array. If you don't specify any elements, spliceCol simply removes elements from the array
     */
    this.spliceCol = function (col, index, amount/*, elements... */) {
      return datamap.spliceCol.apply(datamap, arguments);
    };

    /**
     * Adds/removes data from the row. This function works is modelled after Array.splice.
     * Parameter `row` is the index of row in which do you want to do splice.
     * Parameter `index` is the column index at which to start changing the array.
     * If negative, will begin that many elements from the end. Parameter `amount`, is the number of old array elements to remove.
     * If the amount is 0, no elements are removed. Fourth and further parameters are the `elements` to add to the array.
     * If you don't specify any elements, spliceCol simply removes elements from the array.
     * {@link Handsontable.DataMap#spliceRow}
     *
     * @since 0.11
     * @param {Number} row Index of column in which do you want to do splice.
     * @param {Number} index Index at which to start changing the array. If negative, will begin that many elements from the end
     * @param {Number} amount An integer indicating the number of old array elements to remove. If amount is 0, no elements are removed
     * @param {*} [elements] The elements to add to the array. If you don't specify any elements, spliceCol simply removes elements from the array
     */
    this.spliceRow = function (row, index, amount/*, elements... */) {
      return datamap.spliceRow.apply(datamap, arguments);
    };

    /**
     * Return index of the currently selected cells as an array `[startRow, startCol, endRow, endCol]`.
     *
     * Start row and start col are the coordinates of the active cell (where the selection was started).
     *
     * @returns {Array}
     */
    this.getSelected = function () { //https://github.com/handsontable/handsontable/issues/44  //cjl
      if (selection.isSelected()) {
        return [priv.selRange.from.row, priv.selRange.from.col, priv.selRange.to.row, priv.selRange.to.col];
      }
    };

    /**
     * Returns current selection as a WalkontableCellRange object.
     *
     * @since 0.11
     * @returns {WalkontableCellRange} Returns `undefined` if there is no selection.
     */
    this.getSelectedRange = function () { //https://github.com/handsontable/handsontable/issues/44  //cjl
      if (selection.isSelected()) {
        return priv.selRange;
      }
    };


    /**
     * Rerender the table.
     */
    this.render = function () {
      if (instance.view) {
        instance.forceFullRender = true; //used when data was changed
        selection.refreshBorders(null, true);
      }
    };

    /**
     * Reset all cells in the grid to contain data from the data array.
     *
     * @param {Array} data
     */
    this.loadData = function (data) {
      if (typeof data === 'object' && data !== null) {
        if (!(data.push && data.splice)) { //check if data is array. Must use duck-type check so Backbone Collections also pass it
          //when data is not an array, attempt to make a single-row array of it
          data = [data];
        }
      }
      else if(data === null) {
        data = [];
        var row;
        for (var r = 0, rlen = priv.settings.startRows; r < rlen; r++) {
          row = [];
          for (var c = 0, clen = priv.settings.startCols; c < clen; c++) {
            row.push(null);
          }
          data.push(row);
        }
      }
      else {
        throw new Error("loadData only accepts array of objects or array of arrays (" + typeof data + " given)");
      }

      priv.isPopulated = false;
      GridSettings.prototype.data = data;

      if (Array.isArray(priv.settings.dataSchema) || Array.isArray(data[0])) {
        instance.dataType = 'array';
      }
      else if (typeof priv.settings.dataSchema === 'function') {
        instance.dataType = 'function';
      }
      else {
        instance.dataType = 'object';
      }

      datamap = new Handsontable.DataMap(instance, priv, GridSettings);

      clearCellSettingCache();

      grid.adjustRowsAndCols();
      Handsontable.hooks.run(instance, 'afterLoadData');

      if (priv.firstRun) {
        priv.firstRun = [null, 'loadData'];
      }
      else {
        Handsontable.hooks.run(instance, 'afterChange', null, 'loadData');
        instance.render();
      }

      priv.isPopulated = true;



      function clearCellSettingCache() {
        priv.cellSettings.length = 0;
      }
    };

    /**
     * Return the current data object (the same that was passed by `data` configuration option or `loadData` method).
     * Optionally you can provide cell range `row`, `col`, `row2`, `col2` to get only a fragment of grid data.
     *
     * @param {Number} [r] From row
     * @param {Number} [c] From col
     * @param {Number} [r2] To row
     * @param {Number} [c2] To col
     * @returns {Array|Object}
     */
    this.getData = function (r, c, r2, c2) {
      if (typeof r === 'undefined') {
        return datamap.getAll();
      } else {
        return datamap.getRange(new WalkontableCellCoords(r, c), new WalkontableCellCoords(r2, c2), datamap.DESTINATION_RENDERER);
      }
    };

    /**
     * Get value of selected range. Each column is separated by tab, each row is separated by new line character.
     * {@link Handsontable.DataMap#getCopyableText}
     *
     * @since 0.11
     * @param {Number} startRow From row
     * @param {Number} startCol From col
     * @param {Number} endRow To row
     * @param {Number} endCol To col
     * @returns {Array|Object}
     */
    this.getCopyableData = function (startRow, startCol, endRow, endCol) {
      return datamap.getCopyableText(new WalkontableCellCoords(startRow, startCol), new WalkontableCellCoords(endRow, endCol));
    };

    /**
     * Get schema provided by constructor settings or if it doesn't exist return schema based on data
     * structure on the first row.
     *
     * @since 0.13.2
     * @returns {Object}
     */
    this.getSchema = function () {
      return datamap.getSchema();
    };

    /**
     * Use it if you need to change configuration after initialization.
     *
     * @param {Object} settings Settings to update
     * @param {Boolean} init
     */
    this.updateSettings = function (settings, init) {
      var i, clen;

      if (typeof settings.rows !== "undefined") {
        throw new Error("'rows' setting is no longer supported. do you mean startRows, minRows or maxRows?");
      }
      if (typeof settings.cols !== "undefined") {
        throw new Error("'cols' setting is no longer supported. do you mean startCols, minCols or maxCols?");
      }

      for (i in settings) {
        if (i === 'data') {
          continue; //loadData will be triggered later
        }
        else {
          if (Handsontable.hooks.hooks[i] !== void 0 || Handsontable.hooks.legacy[i] !== void 0) {
            if (typeof settings[i] === 'function' || Array.isArray(settings[i])) {
              instance.addHook(i, settings[i]);
            }
          }
          else {
            // Update settings
            if (!init && settings.hasOwnProperty(i)) {
              GridSettings.prototype[i] = settings[i];
            }
          }
        }
      }

      // Load data or create data map
      if (settings.data === void 0 && priv.settings.data === void 0) {
        instance.loadData(null); //data source created just now
      }
      else if (settings.data !== void 0) {
        instance.loadData(settings.data); //data source given as option
      }
      else if (settings.columns !== void 0) {
        datamap.createMap();
      }

      // Init columns constructors configuration
      clen = instance.countCols();

      //Clear cellSettings cache
      priv.cellSettings.length = 0;

      if (clen > 0) {
        var proto, column;

        for (i = 0; i < clen; i++) {
          priv.columnSettings[i] = Handsontable.helper.columnFactory(GridSettings, priv.columnsSettingConflicts);

          // shortcut for prototype
          proto = priv.columnSettings[i].prototype;

          // Use settings provided by user
          if (GridSettings.prototype.columns) {
            column = GridSettings.prototype.columns[i];
            Handsontable.helper.extend(proto, column);
            Handsontable.helper.extend(proto, expandType(column));
          }
        }
      }

      if (typeof settings.cell !== 'undefined') {
        /* jshint -W089 */
        for (i in settings.cell) {
          var cell = settings.cell[i];
          instance.setCellMetaObject(cell.row, cell.col, cell);
        }
      }

      Handsontable.hooks.run(instance, 'afterCellMetaReset');

      if (typeof settings.className !== "undefined") {
        if (GridSettings.prototype.className) {
          Handsontable.Dom.removeClass(instance.rootElement,GridSettings.prototype.className);
//        instance.rootElement.removeClass(GridSettings.prototype.className);
        }
        if (settings.className) {
          Handsontable.Dom.addClass(instance.rootElement,settings.className);
//        instance.rootElement.addClass(settings.className);
        }
      }

      if (typeof settings.height != 'undefined'){
        var height = settings.height;

        if (typeof height == 'function'){
          height = height();
        }

        instance.rootElement.style.height = height + 'px';
      }

      if (typeof settings.width != 'undefined'){
        var width = settings.width;

        if (typeof width == 'function'){
          width = width();
        }

        instance.rootElement.style.width = width + 'px';
      }

      /* jshint ignore:start */
      if (height){
        instance.rootElement.style.overflow = 'hidden';
      }
      /* jshint ignore:end */

      if (!init) {
        Handsontable.hooks.run(instance, 'afterUpdateSettings');
      }

      grid.adjustRowsAndCols();
      if (instance.view && !priv.firstRun) {
        instance.forceFullRender = true; //used when data was changed
        selection.refreshBorders(null, true);
      }
    };

    /**
     * Get value from selected cell.
     *
     * @since 0.11
     * @returns {*} Returns value of selected cell
     */
    this.getValue = function () {
      var sel = instance.getSelected();
      if (GridSettings.prototype.getValue) {
        if (typeof GridSettings.prototype.getValue === 'function') {
          return GridSettings.prototype.getValue.call(instance);
        }
        else if (sel) {
          return instance.getData()[sel[0]][GridSettings.prototype.getValue];
        }
      }
      else if (sel) {
        return instance.getDataAtCell(sel[0], sel[1]);
      }
    };

    function expandType(obj) {
      if (!obj.hasOwnProperty('type')) {
        // ignore obj.prototype.type
        return;
      }

      var type, expandedType = {};

      if (typeof obj.type === 'object') {
        type = obj.type;
      }
      else if (typeof obj.type === 'string') {
        type = Handsontable.cellTypes[obj.type];
        if (type === void 0) {
          throw new Error('You declared cell type "' + obj.type +
              '" as a string that is not mapped to a known object. Cell type must be an object or a string mapped to an object in Handsontable.cellTypes');
        }
      }


      for (var i in type) {
        if (type.hasOwnProperty(i) && !obj.hasOwnProperty(i)) {
          expandedType[i] = type[i];
        }
      }

      return expandedType;

    }

    /**
     * Get object settings.
     *
     * @returns {Object} Returns an object containing the current grid settings
     */
    this.getSettings = function () {
      return priv.settings;
    };

    /**
     * Clears grid.
     *
     * @since 0.11
     */
    this.clear = function () {
      selection.selectAll();
      selection.empty();
    };

    /**
     * Inserts or removes rows and columns.
     *
     * @param {String} action See grid.alter for possible values: `"insert_row"`, `"insert_col"`, `"remove_row"`, `"remove_col"`
     * @param {Number} index
     * @param {Number} amount
     * @param {String} [source] Source of hook runner
     * @param {Boolean} [keepEmptyRows] Flag for preventing deletion of empty rows
     *
     * @example
     * Insert new row(s) above the row at given `index`. If index is `null` or `undefined`, the new row will be
     * added after the current last row. Default `amount` equals 1.
     * ```js
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer);
     * hot.alter('insert_row', 10);
     * ```
     *
     * Insert new column(s) before the column at given `index`. If index is `null` or `undefined`, the new column
     * will be added after the current last column. Default `amount` equals 1
     * ```js
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer);
     * hot.alter('insert_col', 10);
     * ```
     *
     * Remove the row(s) at given `index`. Default `amount` equals 1
     * ```js
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer);
     * hot.alter('remove_row', 10);
     * ```
     *
     * Remove the column(s) at given `index`. Default `amount` equals 1
     * ```js
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer);
     * hot.alter('remove_col', 10);
     * ```
     */
    this.alter = function (action, index, amount, source, keepEmptyRows) {
      grid.alter(action, index, amount, source, keepEmptyRows);
    };

    /**
     * Returns TD element for given `row`, `col` if it is rendered on screen.
     * Returns `null` if the TD is not rendered on screen (probably because that part of table is not visible).
     *
     * @param {Number} row
     * @param {Number} col
     * @param {Boolean} topmost
     * @returns {Element}
     */
    this.getCell = function (row, col, topmost) {
      return instance.view.getCellAtCoords(new WalkontableCellCoords(row, col), topmost);
    };

    /**
     * Returns coordinates for the provided element.
     *
     * @param {Element} elem
     * @returns {WalkontableCellCoords}
     */
    this.getCoords = function(elem) {
      return this.view.wt.wtTable.getCoords.call(this.view.wt.wtTable, elem);
    };

    /**
     * Returns property name that corresponds with the given column index. {@link Handsontable.DataMap#colToProp}
     *
     * @param {Number} col Column index
     * @returns {String}
     */
    this.colToProp = function (col) {
      return datamap.colToProp(col);
    };

    /**
     * Returns column index that corresponds with the given property. {@link Handsontable.DataMap#propToCol}
     *
     * @param {String} prop
     * @returns {Number}
     */
    this.propToCol = function (prop) {
      return datamap.propToCol(prop);
    };

    /**
     * @description
     * Return cell value at `row`, `col`. `row` and `col` are the __visible__ indexes (note that if columns were reordered or sorted,
     * the current order will be used).
     *
     * @param {Number} row
     * @param {Number} col
     * @returns {*}
     */
    this.getDataAtCell = function (row, col) {
      return datamap.get(row, datamap.colToProp(col));
    };

    /**
     * Return value at `row`, `prop`. {@link Handsontable.DataMap#get}
     *
     * @param {Number} row
     * @param {String} prop
     * @returns {*}
     */
    this.getDataAtRowProp = function (row, prop) {
      return datamap.get(row, prop);
    };

    /**
     * @description
     * Returns array of column values from the data source. `col` is the __visible__ index of the column.
     *
     * @since 0.9-beta2
     * @param {Number} col
     * @returns {Array}
     */
    this.getDataAtCol = function (col) {
      var out = [];
      return out.concat.apply(out, datamap.getRange(new WalkontableCellCoords(0, col), new WalkontableCellCoords(priv.settings.data.length - 1, col), datamap.DESTINATION_RENDERER));
    };

    /**
     * Given the object property name (e.g. `'first.name'`), returns array of column values from the data source.
     *
     * @since 0.9-beta2
     * @param {String} prop
     * @returns {Array} {*}
     */
    this.getDataAtProp = function (prop) {
      var out = [],
          range;

      range = datamap.getRange(
          new WalkontableCellCoords(0, datamap.propToCol(prop)),
          new WalkontableCellCoords(priv.settings.data.length - 1, datamap.propToCol(prop)),
          datamap.DESTINATION_RENDERER);

      return out.concat.apply(out, range);
    };

    /**
     * Returns array of column values from the data source. `col` is the index of the row in the data source.
     *
     * @since 0.11.0-beta3
     * @param {Number} col
     * @returns {Array}
     */
    this.getSourceDataAtCol = function (col) {
      var out = [],
          data = priv.settings.data;

      for (var i = 0; i < data.length; i++) {
        out.push(data[i][col]);
      }

      return out;
    };

    /**
     * Returns a single row of the data (array or object, depending on what you have). `row` is the index of the row in the data source.
     *
     * @since 0.11.0-beta3
     * @param {Number} row
     * @returns {Array|Object}
     */
    this.getSourceDataAtRow = function (row) {
      return priv.settings.data[row];
    };

    /**
     * @description
     * Returns a single row of the data (array or object, depending on what you have). `row` is the __visible__ index of the row.
     *
     * @param {Number} row
     * @returns {*}
     * @since 0.9-beta2
     */
    this.getDataAtRow = function (row) {
      var data = datamap.getRange(new WalkontableCellCoords(row, 0), new WalkontableCellCoords(row, this.countCols() - 1), datamap.DESTINATION_RENDERER);
      return data[0];
    };

    /**
     * Remove `key` property object from cell meta data corresponding to params `row`, `col`.
     *
     * @param {Number} row
     * @param {Number} col
     * @param {String} key
     */
    this.removeCellMeta = function(row, col, key) {
      var cellMeta = instance.getCellMeta(row, col);
      /* jshint ignore:start */
      if(cellMeta[key] != undefined){
        delete priv.cellSettings[row][col][key];
      }
      /* jshint ignore:end */
    };

    /**
     * Set cell meta data object `prop` to corresponding params `row`, `col`
     *
     * @since 0.11
     * @param {Number} row
     * @param {Number} col
     * @param {Object} prop
     */
    this.setCellMetaObject = function (row, col, prop) {
      if (typeof prop === 'object') {
        /* jshint -W089 */
        for (var key in prop) {
          var value = prop[key];
          this.setCellMeta(row, col, key, value);
        }
      }
    };

    /**
     * Sets cell meta data object `key` corresponding to params `row`, `col`.
     *
     * @since 0.11
     * @param {Number} row
     * @param {Number} col
     * @param {String} key
     * @param {String} val
     */
    this.setCellMeta = function (row, col, key, val) {
      if (!priv.cellSettings[row]) {
        priv.cellSettings[row] = [];
      }
      if (!priv.cellSettings[row][col]) {
        priv.cellSettings[row][col] = new priv.columnSettings[col]();
      }
      priv.cellSettings[row][col][key] = val;
      Handsontable.hooks.run(instance, 'afterSetCellMeta', row, col, key, val);
    };

    /**
     * Return cell properties for given `row`, `col` coordinates.
     *
     * @param {Number} row
     * @param {Number} col
     * @returns {Object}
     */
    this.getCellMeta = function (row, col) {
      var prop = datamap.colToProp(col)
          , cellProperties;

      row = translateRowIndex(row);
      col = translateColIndex(col);

      if (!priv.columnSettings[col]) {
        priv.columnSettings[col] = Handsontable.helper.columnFactory(GridSettings, priv.columnsSettingConflicts);
      }

      if (!priv.cellSettings[row]) {
        priv.cellSettings[row] = [];
      }
      if (!priv.cellSettings[row][col]) {
        priv.cellSettings[row][col] = new priv.columnSettings[col]();
      }

      cellProperties = priv.cellSettings[row][col]; //retrieve cellProperties from cache

      cellProperties.row = row;
      cellProperties.col = col;
      cellProperties.prop = prop;
      cellProperties.instance = instance;

      Handsontable.hooks.run(instance, 'beforeGetCellMeta', row, col, cellProperties);
      Handsontable.helper.extend(cellProperties, expandType(cellProperties)); //for `type` added in beforeGetCellMeta

      if (cellProperties.cells) {
        var settings = cellProperties.cells.call(cellProperties, row, col, prop);

        if (settings) {
          Handsontable.helper.extend(cellProperties, settings);
          Handsontable.helper.extend(cellProperties, expandType(settings)); //for `type` added in cells
        }
      }

      Handsontable.hooks.run(instance, 'afterGetCellMeta', row, col, cellProperties);

      return cellProperties;
    };

    /**
     * If displayed rows order is different than the order of rows stored in memory (i.e. sorting is applied)
     * we need to translate logical (stored) row index to physical (displayed) index.
     *
     * @param {Number} row Original row index
     * @returns {Number} Translated row index
     */
    function translateRowIndex(row){
      return Handsontable.hooks.run(instance, 'modifyRow', row);
    }

    /**
     * If displayed columns order is different than the order of columns stored in memory (i.e. column were moved using manualColumnMove plugin)
     * we need to translate logical (stored) column index to physical (displayed) index.
     *
     * @private
     * @param {Number} col Original column index
     * @returns {Number} Translated column index
     */
    function translateColIndex(col){
      // warning: this must be done after datamap.colToProp
      return Handsontable.hooks.run(instance, 'modifyCol', col);
    }

    var rendererLookup = Handsontable.helper.cellMethodLookupFactory('renderer');

    /**
     * Get rederer type by `row` and `col`.
     *
     * @since 0.11
     * @param {Number} row
     * @param {Number} col
     * @returns {Function} Returns rederer type
     */
    this.getCellRenderer = function (row, col) {
      var renderer = rendererLookup.call(this, row, col);

      return Handsontable.renderers.getRenderer(renderer);
    };

    this.getCellEditor = Handsontable.helper.cellMethodLookupFactory('editor');

    this.getCellValidator = Handsontable.helper.cellMethodLookupFactory('validator');


    /**
     * Validates all cells using their validator functions and calls callback when finished. Does not render the view.
     *
     * @param {Function} callback
     */
    this.validateCells = function (callback) {
      var waitingForValidator = new ValidatorsQueue();
      waitingForValidator.onQueueEmpty = callback;

      /* jshint ignore:start */
      var i = instance.countRows() - 1;
      while (i >= 0) {
        var j = instance.countCols() - 1;
        while (j >= 0) {
          waitingForValidator.addValidatorToQueue();
          instance.validateCell(instance.getDataAtCell(i, j), instance.getCellMeta(i, j), function () {
            waitingForValidator.removeValidatorFormQueue();
          }, 'validateCells');
          j--;
        }
        i--;
      }
      /* jshint ignore:end */
      waitingForValidator.checkIfQueueIsEmpty();
    };

    /**
     * Returns array of row headers (if they are enabled). If param `row` given, return header at given row as string.
     *
     * @param {Number} [row]
     * @returns {Array|String}
     */
    this.getRowHeader = function (row) {
      if (row === void 0) {
        var out = [];
        for (var i = 0, ilen = instance.countRows(); i < ilen; i++) {
          out.push(instance.getRowHeader(i));
        }
        return out;
      }
      else if (Array.isArray(priv.settings.rowHeaders) && priv.settings.rowHeaders[row] !== void 0) {
        return priv.settings.rowHeaders[row];
      }
      else if (typeof priv.settings.rowHeaders === 'function') {
        return priv.settings.rowHeaders(row);
      }
      else if (priv.settings.rowHeaders && typeof priv.settings.rowHeaders !== 'string' && typeof priv.settings.rowHeaders !== 'number') {
        return row + 1;
      }
      else {
        return priv.settings.rowHeaders;
      }
    };

    /**
     * Returns information of this table is configured to display row headers.
     *
     * @returns {Boolean}
     * @since 0.11
     */
    this.hasRowHeaders = function () {
      return !!priv.settings.rowHeaders;
    };

    /**
     * Returns information of this table is configured to display column headers.
     *
     * @since 0.11
     * @returns {Boolean}
     */
    this.hasColHeaders = function () {
      if (priv.settings.colHeaders !== void 0 && priv.settings.colHeaders !== null) { //Polymer has empty value = null
        return !!priv.settings.colHeaders;
      }
      for (var i = 0, ilen = instance.countCols(); i < ilen; i++) {
        if (instance.getColHeader(i)) {
          return true;
        }
      }
      return false;
    };

    /**
     * Return array of column headers (if they are enabled). If param `col` given, return header at given column as string
     *
     * @param {Number} [col] Column index
     * @returns {Array|String}
     */
    this.getColHeader = function (col) {
      if (col === void 0) {
        var out = [];
        for (var i = 0, ilen = instance.countCols(); i < ilen; i++) {
          out.push(instance.getColHeader(i));
        }
        return out;
      }
      else {
        var baseCol = col;

        col = Handsontable.hooks.run(instance, 'modifyCol', col);

        if (priv.settings.columns && priv.settings.columns[col] && priv.settings.columns[col].title) {
          return priv.settings.columns[col].title;
        }
        else if (Array.isArray(priv.settings.colHeaders) && priv.settings.colHeaders[col] !== void 0) {
          return priv.settings.colHeaders[col];
        }
        else if (typeof priv.settings.colHeaders === 'function') {
          return priv.settings.colHeaders(col);
        }
        else if (priv.settings.colHeaders && typeof priv.settings.colHeaders !== 'string' && typeof priv.settings.colHeaders !== 'number') {
          return Handsontable.helper.spreadsheetColumnLabel(baseCol); //see #1458
        }
        else {
          return priv.settings.colHeaders;
        }
      }
    };

    /**
     * Return column width from settings (no guessing). Private use intended.
     *
     * @private
     * @param {Number} col
     * @returns {Number}
     */
    this._getColWidthFromSettings = function (col) {
      var cellProperties = instance.getCellMeta(0, col);
      var width = cellProperties.width;

      if (width === void 0 || width === priv.settings.width) {
        width = cellProperties.colWidths;
      }
      if (width !== void 0 && width !== null) {
        switch (typeof width) {
          case 'object': //array
            width = width[col];
            break;

          case 'function':
            width = width(col);
            break;
        }
        if (typeof width === 'string') {
          width = parseInt(width, 10);
        }
      }

      return width;
    };

    /**
     * Return column width
     *
     * @since 0.11
     * @param {Number} col
     * @returns {Number}
     */
    this.getColWidth = function (col) {
      var width = instance._getColWidthFromSettings(col);

      if (!width) {
        width = 50;
      }
      width = Handsontable.hooks.run(instance, 'modifyColWidth', width, col);

      return width;
    };

    /**
     * Return row height from settings (no guessing). Private use intended.
     *
     * @private
     * @param {Number} row
     * @returns {Number}
     */
    this._getRowHeightFromSettings= function (row) {
      /* inefficient
       var cellProperties = instance.getCellMeta(0, row);
       var height = cellProperties.height;
       if (height === void 0 || height === priv.settings.height) {
       height = cellProperties.rowHeights;
       }
       */
      var height = priv.settings.rowHeights; //only uses grid settings

      if (height !== void 0 && height !== null) {
        switch (typeof height) {
          case 'object': //array
            height = height[row];
            break;

          case 'function':
            height = height(row);
            break;
        }
        if (typeof height === 'string') {
          height = parseInt(height, 10);
        }
      }

      return height;
    };

    /**
     * Return row height.
     *
     * @param {Number} row
     * @returns {Number}
     * @since 0.11
     */
    this.getRowHeight = function (row) {
      var height = instance._getRowHeightFromSettings(row);

      height = Handsontable.hooks.run(instance, 'modifyRowHeight', height, row);

      return height;
    };

    /**
     * Returns total number of rows in the grid.
     *
     * @returns {Number} Total number in rows the grid
     */
    this.countRows = function () {
      return priv.settings.data.length;
    };

    /**
     * Returns total number of columns in the grid.
     *
     * @returns {Number} Total number of columns
     */
    this.countCols = function () {
      if (instance.dataType === 'object' || instance.dataType === 'function') {
        if (priv.settings.columns && priv.settings.columns.length) {
          return priv.settings.columns.length;
        }
        else {
          return datamap.colToPropCache.length;
        }
      }
      else if (instance.dataType === 'array') {
        if (priv.settings.columns && priv.settings.columns.length) {
          return priv.settings.columns.length;
        }
        else if (priv.settings.data && priv.settings.data[0] && priv.settings.data[0].length) {
          return priv.settings.data[0].length;
        }
        else {
          return 0;
        }
      }
    };

    /**
     * Get index of first visible row.
     *
     * @returns {Number} Returns index of first visible row
     */
    this.rowOffset = function () {
      return instance.view.wt.wtTable.getFirstRenderedRow();
    };

    /**
     * Get index of first visible column.
     *
     * @returns {Number} Return index of first visible column.
     */
    this.colOffset = function () {
      return instance.view.wt.wtTable.getFirstRenderedColumn();
    };

    /**
     * Return number of rendered rows (including rows partially or fully rendered outside viewport).
     *
     * @returns {Number} Returns -1 if table is not visible
     */
    this.countRenderedRows = function () {
      return instance.view.wt.drawn ? instance.view.wt.wtTable.getRenderedRowsCount() : -1;
    };

    /**
     * Return number of visible rows (rendered rows that fully fit inside viewport).
     *
     * @returns {Number} Returns -1 if table is not visible
     */
    this.countVisibleRows = function () {
      return instance.view.wt.drawn ? instance.view.wt.wtTable.getVisibleRowsCount() : -1;
    };

    /**
     * Return number of visible columns.
     *
     * @returns {Number} Returns -1 if table is not visible
     */
    this.countRenderedCols = function () {
      return instance.view.wt.drawn ? instance.view.wt.wtTable.getRenderedColumnsCount() : -1;
    };

    /**
     * Return number of visible columns. Returns -1 if table is not visible
     * @return {Number}
     */
    this.countVisibleCols = function () {
      return instance.view.wt.drawn ? instance.view.wt.wtTable.getVisibleColumnsCount() : - 1;
    };

    /**
     * Returns number of empty rows. If the optional ending parameter is 1, returns
     * number of empty rows at the bottom of the table.
     *
     * @param {Boolean} [ending] If `true`, will only count empty rows at the end of the data source
     * @returns {Number} Count empty rows
     */
    this.countEmptyRows = function (ending) {
      var i = instance.countRows() - 1,
          empty = 0,
          row;

      while (i >= 0) {
        row = Handsontable.hooks.run(this, 'modifyRow', i);

        if (instance.isEmptyRow(row)) {
          empty ++;

        } else if (ending) {
          break;
        }
        i--;
      }

      return empty;
    };

    /**
     * Returns number of empty columns. If the optional `ending` parameter is `true`, returns number of empty
     * columns at right hand edge of the table.
     *
     * @param {Boolean} [ending] If `true`, will only count empty columns at the end of the data source row
     * @returns {Number} Count empty cols
     */
    this.countEmptyCols = function (ending) {
      if (instance.countRows() < 1) {
        return 0;
      }

      var i = instance.countCols() - 1
          , empty = 0;
      while (i >= 0) {
        if (instance.isEmptyCol(i)) {
          empty++;
        }
        else if (ending) {
          break;
        }
        i--;
      }
      return empty;
    };

    /**
     * Check is `row` is empty.
     *
     * @param {Number} row Row index
     * @returns {Boolean} Return `true` if the row at the given `row` is empty, `false` otherwise.
     */
    this.isEmptyRow = function (row) {
      return priv.settings.isEmptyRow.call(instance, row);
    };

    /**
     * Check is `col` is empty.
     *
     * @param {Number} col Column index
     * @returns {Boolean} Return `true` if the column at the given `col` is empty, `false` otherwise.
     */
    this.isEmptyCol = function (col) {
      return priv.settings.isEmptyCol.call(instance, col);
    };

    /**
     * Select cell `row`, `col` or range finishing at `endRow`, `endCol`. By default, viewport will be scrolled to selection.
     *
     * @param {Number} row
     * @param {Number} col
     * @param {Number} [endRow]
     * @param {Number} [endCol]
     * @param {Boolean} [scrollToCell=true] If `true`, viewport will be scrolled to the selection
     * @returns {Boolean}
     */
    this.selectCell = function (row, col, endRow, endCol, scrollToCell) {
      if (typeof row !== 'number' || row < 0 || row >= instance.countRows()) {
        return false;
      }
      if (typeof col !== 'number' || col < 0 || col >= instance.countCols()) {
        return false;
      }
      if (typeof endRow !== "undefined") {
        if (typeof endRow !== 'number' || endRow < 0 || endRow >= instance.countRows()) {
          return false;
        }
        if (typeof endCol !== 'number' || endCol < 0 || endCol >= instance.countCols()) {
          return false;
        }
      }
      var coords = new WalkontableCellCoords(row, col);
      priv.selRange = new WalkontableCellRange(coords, coords, coords);
      if (document.activeElement && document.activeElement !== document.documentElement && document.activeElement !== document.body) {
        document.activeElement.blur(); //needed or otherwise prepare won't focus the cell. selectionSpec tests this (should move focus to selected cell)
      }
      instance.listen();
      if (typeof endRow === "undefined") {
        selection.setRangeEnd(priv.selRange.from, scrollToCell);
      }
      else {
        selection.setRangeEnd(new WalkontableCellCoords(endRow, endCol), scrollToCell);
      }

      instance.selection.finish();
      return true;
    };

    /**
     * Select cell `row`, `prop` or range finishing at `endRow`, `endProp`. By default, viewport will be scrolled to selection.
     *
     * @param {Number} row
     * @param {Object} prop
     * @param {Number} [endRow]
     * @param {Object} [endProp]
     * @param {Boolean} [scrollToCell=true] If `true`, viewport will be scrolled to the selection
     * @returns {Boolean}
     */
    this.selectCellByProp = function (row, prop, endRow, endProp, scrollToCell) {
      /* jshint ignore:start */
      arguments[1] = datamap.propToCol(arguments[1]);
      if (typeof arguments[3] !== "undefined") {
        arguments[3] = datamap.propToCol(arguments[3]);
      }
      return instance.selectCell.apply(instance, arguments);
      /* jshint ignore:end */
    };

    /**
     * Deselects current cell selection on grid.
     */
    this.deselectCell = function () {
      selection.deselect();
    };

    /**
     * Remove grid from DOM.
     */
    this.destroy = function () {

      instance._clearTimeouts();
      if (instance.view) { //in case HT is destroyed before initialization has finished
        instance.view.destroy();
      }


      Handsontable.Dom.empty(instance.rootElement);
      eventManager.clear();

      Handsontable.hooks.run(instance, 'afterDestroy');
      Handsontable.hooks.destroy(instance);

      for (var i in instance) {
        if (instance.hasOwnProperty(i)) {
          //replace instance methods with post mortem
          if (typeof instance[i] === "function") {
            if (i !== "runHooks") {
              instance[i] = postMortem;
            }
          }
          //replace instance properties with null (restores memory)
          //it should not be necessary but this prevents a memory leak side effects that show itself in Jasmine tests
          else if (i !== "guid") {
            instance[i] = null;
          }
        }
      }


      //replace private properties with null (restores memory)
      //it should not be necessary but this prevents a memory leak side effects that show itself in Jasmine tests
      priv = null;
      datamap = null;
      grid = null;
      selection = null;
      editorManager = null;
      instance = null;
      GridSettings = null;
    };

    /**
     * Replacement for all methods after Handsotnable was destroyed.
     *
     * @private
     */
    function postMortem() {
      throw new Error("This method cannot be called because this Handsontable instance has been destroyed");
    }

    /**
     * Returns active editor object. {@link Handsontable.EditorManager#getActiveEditor}
     *
     * @returns {Object}
     */
    this.getActiveEditor = function(){
      return editorManager.getActiveEditor();
    };

    /**
     * Return Handsontable instance.
     *
     * @returns {Handsontable}
     */
    this.getInstance = function () {
      return instance;
    };

    /**
     * {@link Handsontable.Hooks#add}
     *
     * @param {String} key
     * @param {Function} fn
     */
    this.addHook = function (key, fn) {
      Handsontable.hooks.add(key, fn, instance);
    };

    /**
     * {@link Handsontable.Hooks#once}
     *
     * @param {String} key
     * @param {Function} fn
     */
    this.addHookOnce = function (key, fn) {
      Handsontable.hooks.once(key, fn, instance);
    };

    /**
     * {@link Handsontable.Hooks#remove}
     *
     * @param {String} key
     * @param {Function} fn
     */
    this.removeHook = function (key, fn) {
      Handsontable.hooks.remove(key, fn, instance);
    };

    /**
     * {@link Handsontable.Hooks#run}
     *
     * @param {String} key
     * @param {*} p1
     * @param {*} p2
     * @param {*} p3
     * @param {*} p4
     * @param {*} p5
     * @param {*} p6
     */
    this.runHooks = function (key, p1, p2, p3, p4, p5, p6) {
      return Handsontable.hooks.run(instance, key, p1, p2, p3, p4, p5, p6);
    };

    this.timeouts = [];

    /**
     * Sets timeout. Purpose of this method is to clear all known timeouts when `destroy` method is called.
     *
     * @param {*} handle
     * @private
     */
    this._registerTimeout = function (handle) {
      this.timeouts.push(handle);
    };

    /**
     * Clears all known timeouts.
     *
     * @private
     */
    this._clearTimeouts = function () {
      for(var i = 0, ilen = this.timeouts.length; i<ilen; i++) {
        clearTimeout(this.timeouts[i]);
      }
    };

    /**
     * Handsontable version
     *
     * @type {String}
     */
    this.version = '0.14.1'; //inserted by grunt from package.json
  };

  /**
   * @alias Handsontable.Options
   * @constructor
   * @description

   * ## Constructor options
   *
   * Constructor options are applied using an object literal passed as a first argument to the Handsontable constructor.
   *
   * @example
   * ```js
   * var exampleContainer = document.getElementById('example1');
   * var hot = new Handsontable(exampleContainer, {
 *   data: myArray,
 *   width: 400,
 *   height: 300
 * })
   * ```
   *
   * ---
   * ## Cascading configuration
   *
   * Handsontable 0.9 and newer is using *Cascading Configuration*, which is fast way to provide configuration options
   * for whole table, its columns and particular cells.
   *
   * Consider the following example:
   * ```js
   * var exampleContainer = document.getElementById('example');
   * var hot = new Handsontable(exampleContainer, {
 *   readOnly: true,
 *   columns: [
 *     {readOnly: false},
 *     {},
 *     {}
 *   ],
 *   cells: function (row, col, prop) {
 *     var cellProperties = {};
 *
 *     if (row === 0 && col === 0) {
 *       cellProperties.readOnly = true;
 *     }
 *
 *     return cellProperties;
 *   }
 * });
   * ```
   *
   * The above notation will result in all TDs being *read only*, except for first column TDs which will be *editable*, except for the TD in top left corner which will still be *read only*.
   *
   * ### The Cascading Configuration model
   *
   * ##### 1. Constructor
   *
   * Configuration options that are provided using first-level `handsontable(container, {option: "value"})` and `updateSettings` method.
   *
   * ##### 2. Columns
   *
   * Configuration options that are provided using second-level object `handsontable(container, {columns: {option: "value"}]})`
   *
   * ##### 3. Cells
   *
   * Configuration options that are provided using second-level function `handsontable(container, {cells: function: (row, col, prop){ }})`
   *
   * ---
   * ## Architecture performance
   *
   * The Cascading Configuration model is based on prototypical inheritance. It is much faster and memory efficient compared
   * to the previous model that used jQuery extend. See: http://jsperf.com/extending-settings.
   *
   * ---
   * __Important notice:__ In order for the data separation to work properly, make sure that each instance of Handsontable has a unique `id`.
   */
  var DefaultSettings = function () {};

  DefaultSettings.prototype = {
    /**
     * @description
     * Initial data source that will be bound to the data grid __by reference__ (editing data grid alters the data source).
     * Can be Array of Array, Array of Objects or Function.
     *
     * See [Understanding binding as reference](http://handsontable.com/demo/understanding_reference.html).
     *
     * @type {Array|Function}
     * @default undefined
     */
    data: void 0,

    /**
     * @description
     * Defines the structure of a new row when data source is an object.
     * Default like the first data row Array or Object.
     *
     *  See [demo/datasources.html](http://handsontable.com/demo/datasources.html) for examples.
     *
     * @type {Object}
     * @default undefined
     */
    dataSchema: void 0,

    /**
     * Width of the grid. Can be a number or a function that returns a number.
     *
     * @type {Number|Function}
     * @default undefined
     */
    width: void 0,

    /**
     * Height of the grid. Can be a number or a function that returns a number.
     *
     * @type {Number|Function}
     * @default undefined
     */
    height: void 0,

    /**
     * @description
     * Initial number of rows.
     *
     * __Notice:__ This option only has effect in Handsontable constructor and only if `data` option is not provided
     *
     * @type {Number}
     * @default 5
     */
    startRows: 5,

    /**
     * @description
     * Initial number of columns.
     *
     * __Notice:__ This option only has effect in Handsontable constructor and only if `data` option is not provided
     *
     * @type {Number}
     * @default 5
     */
    startCols: 5,

    /**
     * Setting `true` or `false` will enable or disable the default row headers (1, 2, 3).
     * You can also define an array `['One', 'Two', 'Three', ...]` or a function to define the headers.
     * If a function is set the index of the row is passed as a parameter.
     *
     * @type {Boolean|Array|Function}
     * @default null
     * @example
     *  ...
     *  // as boolean
     *  rowHeaders: true,
     *  ...
     *
     *  ...
     *  // as array
     *  rowHeaders: [1, 2, 3],
     *  ...
     *
     *  ...
     *  // as function
     *  rowHeaders: function(index) {
   *    return index + ': AB';
   *  },
     *  ...
     */
    rowHeaders: null,

    /**
     * Setting `true` or `false` will enable or disable the default column headers (A, B, C).
     * You can also define an array `['One', 'Two', 'Three', ...]` or a function to define the headers.
     * If a function is set the index of the column is passed as a parameter.
     *
     * @type {Boolean|Array|Function}
     * @default null
     * @example
     *  ...
     *  // as boolean
     *  colHeaders: true,
     *  ...
     *
     *  ...
     *  // as array
     *  colHeaders: ['A', 'B', 'C'],
     *  ...
     *
     *  ...
     *  // as function
     *  colHeaders: function(index) {
   *    return index + ': AB';
   *  },
     *  ...
     */
    colHeaders: null,

    /**
     * Defines column widths in pixels. Accepts number, string (that will be converted to number),
     * array of numbers (if you want to define column width separately for each column) or a
     * function (if you want to set column width dynamically on each render).
     *
     * @type {Array|Function|Number|String}
     * @default undefined
     */
    colWidths: void 0,

    /**
     * @description
     * Defines the cell properties and data binding for certain columns.
     *
     * __Notice:__ Using this option sets a fixed number of columns (options `startCols`, `minCols`, `maxCols` will be ignored).
     *
     * See [demo/datasources.html](http://handsontable.com/demo/datasources.html) for examples.
     *
     * @type {Array}
     * @default undefined
     * @example
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   columns: [
   *     {
   *       // column options for the first column
   *       type: 'numeric',
   *       format: '0,0.00 $'
   *     },
   *     {
   *       // column options for the second column
   *       type: 'text',
   *       readOnly: true
   *     }
   *   ]
   * });
     * ...
     */
    columns: void 0,

    /**
     * @description
     * Defines the cell properties for given `row`, `col`, `prop` coordinates.
     * Any constructor or column option may be overwritten for a particular cell (row/column combination), using `cell`
     * array passed to the Handsontable constructor. Or using `cells` function property to the Handsontable constructor.
     *
     * @type {Function}
     * @default undefined
     * @example
     * ```js
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   cells: function (row, col, prop) {
   *     var cellProperties = {};
   *
   *     if (row === 0 && col === 0) {
   *       cellProperties.readOnly = true;
   *     }
   *
   *     return cellProperties;
   *   }
   * });
     * ...
     * ```
     */
    cells: void 0,

    /**
     * Any constructor or column option may be overwritten for a particular cell (row/column combination), using `cell`
     * array passed to the Handsontable constructor.
     *
     * @type {Array}
     * @default []
     * @example
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   cell: [
   *     {row: 0, col: 0, readOnly: true}
   *   ]
   * });
     * ...
     */
    cell: [],

    /**
     * @description
     * If `true`, enables Comments plugin, which enables applying cell comments through the context menu
     * (configurable with context menu keys commentsAddEdit, commentsRemove).
     *
     * To initialize Handsontable with predefined comments, provide cell coordinates and comment texts in form of an array.
     *
     * See [Comments](http://handsontable.com/demo/comments.html) demo for examples.
     *
     * @since 0.11.0
     * @type {Boolean|Array}
     * @default false
     * @example
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   comments: [{row: 1, col: 1, comment: "Test comment"}]
   * });
     * ...
     */
    comments: false,

    /**
     * @description
     * If `true`, enables Custom Borders plugin, which enables applying custom borders through the context menu (configurable with context menu key borders).
     *
     * To initialize Handsontable with predefined custom borders, provide cell coordinates and border styles in form of an array.
     *
     * See [Custom Borders](http://handsontable.com/demo/custom_borders.html) demo for examples.
     *
     * @since 0.11.0
     * @type {Boolean|Array}
     * @default false
     * @example
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   customBorders: [{range: {from: {row: 1, col: 1}, to: {row: 3, col: 4}}, left: {}, right: {}, top: {}, bottom: {}}],
   * });
     * ...
     *
     * // or
     * ...
     * var exampleContainer = document.getElementById('example');
     * var hot = new Handsontable(exampleContainer, {
   *   customBorders: [{row: 2, col: 2, left: {width: 2, color: 'red'}, right: {width: 1, color: 'green'}, top: '', bottom: ''}],
   * });
     * ...
     */
    customBorders: false,

    /**
     * Minimum number of rows. At least that many of rows will be created during initialization.
     *
     * @type {Number}
     * @default 0
     */
    minRows: 0,

    /**
     * Minimum number of columns. At least that many of columns will be created during initialization.
     *
     * @type {Number}
     * @default 0
     */
    minCols: 0,

    /**
     * Maximum number of rows.
     *
     * @type {Number}
     * @default Infinity
     */
    maxRows: Infinity,

    /**
     * Maximum number of cols.
     *
     * @type {Number}
     * @default Infinity
     */
    maxCols: Infinity,

    /**
     * When set to 1 (or more), Handsontable will add a new row at the end of grid if there are no more empty rows.
     *
     * @type {Number}
     * @default 0
     */
    minSpareRows: 0,

    /**
     * When set to 1 (or more), Handsontable will add a new column at the end of grid if there are no more empty columns.
     *
     * @type {Number}
     * @default 0
     */
    minSpareCols: 0,

    /**
     * @type {Boolean}
     * @default true
     */
    allowInsertRow: true,

    /**
     * @type {Boolean}
     * @default true
     */
    allowInsertColumn: true,

    /**
     * @type {Boolean}
     * @default true
     */
    allowRemoveRow: true,

    /**
     * @type {Boolean}
     * @default true
     */
    allowRemoveColumn: true,

    /**
     * If true, selection of multiple cells using keyboard or mouse is allowed.
     *
     * @type {Boolean}
     * @default true
     */
    multiSelect: true,

    /**
     * Enables the fill handle (drag-down and copy-down) functionality, which shows the small rectangle in bottom
     * right corner of the selected area, that let's you expand values to the adjacent cells.
     *
     * Possible values: `true` (to enable in all directions), `"vertical"` or `"horizontal"` (to enable in one direction),
     * `false` (to disable completely). Setting to `true` enables the fillHandle plugin.
     *
     * @type {Boolean|String}
     * @default true
     */
    fillHandle: true,

    /**
     * Allows to specify the number of rows fixed (aka freezed) on the top of the table.
     *
     * @type {Number}
     * @default 0
     */
    fixedRowsTop: 0,

    /**
     * Allows to specify the number of columns fixed (aka freezed) on the left side of the table.
     *
     * @type {Number}
     * @default 0
     */
    fixedColumnsLeft: 0,

    /**
     * If `true`, mouse click outside the grid will deselect the current selection.
     *
     * @type {Boolean}
     * @default true
     */
    outsideClickDeselects: true,

    /**
     * If `true`, <kbd>ENTER</kbd> begins editing mode (like Google Docs). If `false`, <kbd>ENTER</kbd> moves to next
     * row (like Excel) and adds new row if necessary. <kbd>TAB</kbd> adds new column if necessary.
     *
     * @type {Boolean}
     * @default true
     */
    enterBeginsEditing: true,

    /**
     * Defines cursor move after <kbd>ENTER</kbd> is pressed (<kbd>SHIFT</kbd> + <kbd>ENTER</kbd> uses negative vector).
     * Can be an object or a function that returns an object. The event argument passed to the function
     * is a DOM Event object received after a <kbd>ENTER</kbd> key has been pressed. This event object can be used to check
     * whether user pressed <kbd>ENTER</kbd> or <kbd>SHIFT</kbd> + <kbd>ENTER</kbd>.
     *
     * @type {Object|Function}
     * @default {row: 1, col: 0}
     */
    enterMoves: {row: 1, col: 0},

    /**
     * Defines cursor move after <kbd>TAB</kbd> is pressed (<kbd>SHIFT</kbd> + <kbd>TAB</kbd> uses negative vector).
     * Can be an object or a function that returns an object. The event argument passed to the function
     * is a DOM Event object received after a <kbd>TAB</kbd> key has been pressed. This event object can be used to check
     * whether user pressed <kbd>TAB</kbd> or <kbd>SHIFT</kbd> + <kbd>TAB</kbd>.
     *
     * @type {Object}
     * @default {row: 0, col: 1}
     */
    tabMoves: {row: 0, col: 1},

    /**
     * If `true`, pressing <kbd>TAB</kbd> or right arrow in the last column will move to first column in next row
     *
     * @type {Boolean}
     * @default false
     */
    autoWrapRow: false,

    /**
     * If `true`, pressing <kbd>ENTER</kbd> or down arrow in the last row will move to first row in next column
     *
     * @type {Boolean}
     * @default false
     */
    autoWrapCol: false,

    /**
     * Maximum number of rows than can be copied to clipboard using <kbd>CTRL</kbd> + <kbd>C</kbd>.
     *
     * @type {Number}
     * @default 1000
     */
    copyRowsLimit: 1000,

    /**
     * Maximum number of columns than can be copied to clipboard using <kbd>CTRL</kbd> + <kbd>C</kbd>.
     *
     * @type {Number}
     * @default 1000
     */
    copyColsLimit: 1000,

    /**
     * Defines paste (<kbd>CTRL</kbd> + <kbd>V</kbd>) behavior. Default value `"overwrite"` will paste clipboard value over current selection.
     * When set to `"shift_down"`, clipboard data will be pasted in place of current selection, while all selected cells are moved down.
     * When set to `"shift_right"`, clipboard data will be pasted in place of current selection, while all selected cells are moved right.
     *
     * @type {String}
     * @default 'overwrite'
     */
    pasteMode: 'overwrite',

    /**
     * @description
     * Turn on saving the state of column sorting, columns positions and columns sizes in local storage.
     *
     * You can save any sort of data in local storage in to preserve table state between page reloads.
     * In order to enable data storage mechanism, `persistentState` option must be set to `true` (you can set it
     * either during Handsontable initialization or using the `updateSettings` method). When `persistentState` is enabled it exposes 3 hooks:
     *
     * __persistentStateSave__ (key: String, value: Mixed)
     *
     *   * Saves value under given key in browser local storage.
     *
     * __persistentStateLoad__ (key: String, valuePlaceholder: Object)
     *
     *   * Loads `value`, saved under given key, form browser local storage. The loaded `value` will be saved in `valuePlaceholder.value`
     *     (this is due to specific behaviour of `PluginHooks.execute()` method). If no value have been saved under key `valuePlaceholder.value`
     *     will be `undefined`.
     *
     * __persistentStateReset__ (key: String)
     *
     *   * Clears the value saved under `key`. If no `key` is given, all values associated with table will be cleared.
     *
     * __Note:__ The main reason behind using `persistentState` hooks rather than regular LocalStorage API is that it
     * ensures separation of data stored by multiple Handsontable instances. In other words, if you have two (or more)
     * instances of Handsontable on one page, data saved by one instance won't be accessible by the second instance.
     * Those two instances can store data under the same key and no data would be overwritten.
     *
     * __Important:__ In order for the data separation to work properly, make sure that each instance of Handsontable has a unique `id`.
     *
     * @type {Boolean}
     * @default false
     */
    persistentState: false,

    /**
     * Class name for all visible rows in current selection.
     *
     * @type {String}
     * @default undefined
     */
    currentRowClassName: void 0,

    /**
     * Class name for all visible columns in current selection.
     *
     * @type {String}
     * @default undefined
     */
    currentColClassName: void 0,

    /**
     * @description
     * [Column stretching](http://handsontable.com/demo/scroll.html) mode. Possible values: `"none"`, `"last"`, `"all"`.
     *
     * @type {String}
     * @default 'none'
     */
    stretchH: 'none',

    /**
     * Lets you overwrite the default `isEmptyRow` method.
     *
     * @type {Function}
     * @param {Number} row
     * @returns {Boolean}
     */
    isEmptyRow: function (row) {
      var col, colLen, value, meta;

      for (col = 0, colLen = this.countCols(); col < colLen; col ++) {
        value = this.getDataAtCell(row, col);

        if (value !== '' && value !== null && typeof value !== 'undefined') {
          if (typeof value === 'object') {
            meta = this.getCellMeta(row, col);

            return Handsontable.helper.isObjectEquals(this.getSchema()[meta.prop], value);
          }
          return false;
        }
      }

      return true;
    },

    /**
     * Lets you overwrite the default `isEmptyCol` method.
     *
     * @type {Function}
     * @param {Number} col
     * @returns {Boolean}
     */
    isEmptyCol: function (col) {
      var row, rowLen, value;

      for (row = 0, rowLen = this.countRows(); row < rowLen; row ++) {
        value = this.getDataAtCell(row, col);

        if (value !== '' && value !== null && typeof value !== 'undefined') {
          return false;
        }
      }

      return true;
    },

    /**
     * When set to `true`, the table is rerendered when it is detected that it was made visible in DOM.
     *
     * @type {Boolean}
     * @default true
     */
    observeDOMVisibility: true,

    /**
     * If set to `true`, cells will accept value that is marked as invalid by cell `validator`, with a background color
     * automatically applied using CSS class `htInvalid`. If set to `false`, cells will not accept invalid value.
     *
     * @type {Boolean}
     * @default true
     * @since 0.9.5
     */
    allowInvalid: true,

    /**
     * CSS class name for cells that did not pass validation.
     *
     * @type {String}
     * @default 'htInvalid'
     */
    invalidCellClassName: 'htInvalid',

    /**
     * When set to an non-empty string, displayed as the cell content for empty cells.
     *
     * @type {Boolean|String}
     * @default false
     */
    placeholder: false,

    /**
     * CSS class name for cells that have a placeholder in use.
     *
     * @type {String}
     * @default 'htPlaceholder'
     */
    placeholderCellClassName: 'htPlaceholder',

    /**
     * CSS class name for read-only cells.
     *
     * @type {String}
     * @default 'htDimmed'
     */
    readOnlyCellClassName: 'htDimmed',

    /**
     * String or rendering function.
     * String may be one of the following predefined values: `autocomplete`, `checkbox`, `text`, `numeric`.
     * Function will receive the following arguments: `function(instance, TD, row, col, prop, value, cellProperties) {}`
     * You can map your own function to a string like this: `Handsontable.cellLookup.renderer.myRenderer = myRenderer;`
     *
     * @type {String|Function}
     * @default undefined
     */
    renderer: void 0,

    /**
     * @type {String}
     * @default 'htCommentCell'
     */
    commentedCellClassName: 'htCommentCell',

    /**
     * Setting to `true` enables selecting just a fragment of the text within a single cell or between adjacent cells.
     *
     * @type {Boolean}
     * @default false
     */
    fragmentSelection: false,

    /**
     * @description
     * Make cell [read only](http://handsontable.com/demo/readonly.html).
     *
     * @type {Boolean}
     * @default false
     */
    readOnly: false,

    /**
     * @description
     * Setting to true enables the search plugin (see [demo](http://handsontable.com/demo/search.html)).
     *
     * @type {Boolean}
     * @default false
     */
    search: false,

    /**
     * @description
     * Shortcut to define combination of cell renderer and editor for the column.
     *
     * Possible values: text, [numeric](http://handsontable.com/demo/numeric.html), [date](http://handsontable.com/demo/date.html),
     * [checkbox](http://handsontable.com/demo/checkbox.html), [autocomplete](http://handsontable.com/demo/autocomplete.html),
     * [handsontable](http://handsontable.com/demo/handsontable.html).
     *
     * @type {String}
     * @default 'text'
     */
    type: 'text',

    /**
     * @description
     * Make cell copyable (pressing <kbd>CTRL</kbd> + <kbd>C</kbd> on your keyboard moves its value to system clipboard).
     *
     * __Note:__ this setting is `false` by default for cells with type `password`.
     *
     * @type {Boolean}
     * @default true
     * @since 0.10.2
     */
    copyable: true,

    /**
     * String or rendering function.
     * String may be one of the following predefined values: `autocomplete`, `checkbox`, `text`, `date`, `handsontable`.
     * Function will receive the following arguments: `function(instance, td, row, col, prop, value, cellProperties) {}`
     * You can map your own function to a string like this: `Handsontable.cellLookup.renderer.myEditor = myEditor;`
     *
     * @type {String|Function}
     * @default 'text'
     */
    editor: 'text',

    /**
     * @description
     * Autocomplete definitions. See [demo/autocomplete.html](http://handsontable.com/demo/autocomplete.html) for examples and definitions.
     *
     * @type {Array}
     * @default undefined
     */
    autoComplete: void 0,

    /**
     * Setting to true enables the debug mode, currently used to test the correctness of the row and column
     * header fixed positioning on a layer above the master table.
     *
     * @type {Boolean}
     * @default false
     */
    debug: false,

    /**
     * When set to `true`, the text of the cell content is wrapped if it does not fit in the fixed column width.
     *
     * @type {Boolean}
     * @default true
     * @since 0.11.0
     */
    wordWrap: true,

    /**
     * CSS class name added to cells with cell meta `wordWrap: false`.
     *
     * @type {String}
     * @default 'htNoWrap'
     * @since 0.11.0
     */
    noWordWrapClassName: 'htNoWrap',

    /**
     * @description
     * Defines if the right-click context menu should be enabled. Context menu allows to create new row or
     * column at any place in the grid. Possible values: `true` (to enable basic options), `false` (to disable completely)
     * or array of any available strings: `["row_above", "row_below", "col_left", "col_right",
     * "remove_row", "remove_col", "undo", "redo", "sep1", "sep2", "sep3"]`.
     *
     * See [demo/contextmenu.html](http://handsontable.com/demo/contextmenu.html) for examples.
     *
     * @type {Boolean|Array}
     * @default undefined
     */
    contextMenu: void 0,

    /**
     * If `true`, undo/redo functionality is enabled.
     *
     * @type {Boolean}
     * @default undefined
     */
    undo: void 0,

    /**
     * @description
     * Turn on [Column sorting](http://handsontable.com/demo/sorting.html).
     *
     * @type {Boolean}
     * @default undefined
     */
    columnSorting: void 0,

    /**
     * @description
     * Turn on [Manual column move](http://handsontable.com/demo/column_move.html), if set to a boolean or define initial
     * column order, if set to an array of column indexes.
     *
     * @type {Boolean|Array}
     * @default undefined
     */
    manualColumnMove: void 0,

    /**
     * @description
     * Turn on [Manual column resize](http://handsontable.com/demo/column_resize.html), if set to a boolean or define initial
     * column resized widths, if set to an array of numbers.
     *
     * @type {Boolean|Array}
     * @default undefined
     */
    manualColumnResize: void 0,

    /**
     * @description
     * Turn on [Manual row move](http://handsontable.com/demo/column_move.html), if set to a boolean or define initial
     * row order, if set to an array of row indexes.
     *
     * @type {Boolean|Array}
     * @default undefined
     * @since 0.11.0
     */
    manualRowMove: void 0,

    /**
     * @description
     * Turn on [Manual row resize](http://handsontable.com/demo/column_resize.html), if set to a boolean or define initial
     * row resized heights, if set to an array of numbers.
     *
     * @type {Boolean|Array}
     * @default undefined
     * @since 0.11.0
     */
    manualRowResize: void 0,

    /**
     * @description
     * Setting to true or array enables the mergeCells plugin, which enables the merging of the cells. (see [demo](http://handsontable.com/demo/merge_cells.html)).
     * You can provide the merged cells on the pageload if you feed the mergeCells option with an array.
     *
     * @type {Boolean|Array}
     * @default false
     */
    mergeCells: false,

    /**
     * Number of rows to be prerendered before and after the viewport is changed.
     *
     * @type {Number}
     * @default 10
     */
    viewportRowRenderingOffset: 10,

    /**
     * Number of columns to be prerendered before and after the viewport is changed.
     *
     * @type {Number}
     * @default 10
     */
    viewportColumnRenderingOffset: 10,

    /**
     * @description
     * If `true`, enables Grouping plugin, which enables applying expandable row and column groups.
     * To initialize Handsontable with predefined groups, provide row or column group start and end coordinates in form of an array.
     *
     * See [Grouping](http://handsontable.com/demo/grouping.html) demo for examples.
     *
     * @type {Boolean|Array}
     * @default undefined
     * @since 0.11.4
     * @example
     *  ...
     *  // as boolean
     *  groups: true,
     *  ...
     *
     *  ...
     *  // as array
     *  groups: [{cols: [0, 2]}, {cols: [5, 15], rows: [0, 5]}],
     *  ...
     */
    groups: void 0,

    /**
     * A usually small function or regular expression that validates the input.
     * After you determine if the input is valid, execute `callback(true)` or `callback(false)` to proceed with the execution.
     * In function, `this` binds to cellProperties.
     *
     * @type {Function|RegExp}
     * @default undefined
     * @since 0.9.5
     */
    validator: void 0,

    /**
     * @description
     * Disable visual cells selection.
     *
     * Possible values:
     *  `true` - Disables any type of visual selection (current and area selection),
     *  `false` - Enables any type of visual selection. This is default value.
     *  `current` - Disables to appear only current selected cell.
     *  `area` - Disables to appear only multiple selected cells.
     *
     * @type {Boolean|String|Array}
     * @default false
     * @since 0.13.2
     * @example
     *  ...
     *  // as boolean
     *  disableVisualSelection: true,
     *  ...
     *
     *  ...
     *  // as string ('current' or 'area')
     *  disableVisualSelection: 'current',
     *  ...
     *
     *  ...
     *  // as array
     *  disableVisualSelection: ['current', 'area'],
     *  ...
     */
    disableVisualSelection: false,
    manualColumnFreeze: void 0,
    trimWhitespace: true,
    settings: void 0,
    source: void 0,
    title: void 0,
    checkedTemplate: void 0,
    uncheckedTemplate: void 0,
    format: void 0,
    className: void 0
  };
  Handsontable.DefaultSettings = DefaultSettings;

  (function (window) {
    'use strict';

    function MultiMap() {
      var map = {
        arrayMap: [],
        weakMap: new WeakMap()
      };

      return {
        'get': function (key) {
          if (canBeAnArrayMapKey(key)) {
            return map.arrayMap[key];
          } else if (canBeAWeakMapKey(key)) {
            return map.weakMap.get(key);
          }
        },

        'set': function (key, value) {
          if (canBeAnArrayMapKey(key)) {
            map.arrayMap[key] = value;
          } else if (canBeAWeakMapKey(key)) {
            map.weakMap.set(key, value);
          } else {
            throw new Error('Invalid key type');
          }


        },

        'delete': function (key) {
          if (canBeAnArrayMapKey(key)) {
            delete map.arrayMap[key];
          } else if (canBeAWeakMapKey(key)) {
            map.weakMap['delete'](key);  //Delete must be called using square bracket notation, because IE8 does not handle using `delete` with dot notation
          }
        }
      };



      function canBeAnArrayMapKey(obj){
        return obj !== null && !isNaNSymbol(obj) && (typeof obj == 'string' || typeof obj == 'number');
      }

      function canBeAWeakMapKey(obj){
        return obj !== null && (typeof obj == 'object' || typeof obj == 'function');
      }

      function isNaNSymbol(obj){
        return obj !== obj; // NaN === NaN is always false
      }

    }

    if (!window.MultiMap){
      window.MultiMap = MultiMap;
    }

  })(window);
  /**
   * DOM helper optimized for maximum performance
   * It is recommended for Handsontable plugins and renderers, because it is much faster than jQuery
   * @type {Object}
   */
  if (!window.Handsontable) {
    var Handsontable = {}; //required because Walkontable test suite uses this class directly
  }
  Handsontable.Dom = {};


  Handsontable.Dom.enableImmediatePropagation = function (event) {
    if (event != null && event.isImmediatePropagationEnabled == null) {
      event.stopImmediatePropagation = function () {
        this.isImmediatePropagationEnabled = false;
        this.cancelBubble = true;
      };
      event.isImmediatePropagationEnabled = true;
      event.isImmediatePropagationStopped = function () {
        return !this.isImmediatePropagationEnabled;
      };
    }
  };

  /**
   * Goes up the DOM tree (including given element) until it finds an element that matches the nodes or nodes name.
   * This method goes up through web components.
   *
   * @param {HTMLElement} element Element from which traversing is started
   * @param {Array} nodes Array of elements or Array of elements name
   * @param {HTMLElement} [until]
   * @returns {HTMLElement|null}
   */
  Handsontable.Dom.closest = function (element, nodes, until) {
    while (element != null && element !== until) {
      if (element.nodeType === Node.ELEMENT_NODE &&
          (nodes.indexOf(element.nodeName) > -1 || nodes.indexOf(element) > -1)) {
        return element;
      }
      if (element.host && element.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
        element = element.host;

      } else {
        element = element.parentNode;
      }
    }

    return null;
  };

  /**
   * Goes up the DOM tree and checks if element is child of another element
   * @param child Child element
   * @param {Object|string} parent Parent element OR selector of the parent element. If classname provided, function returns true for the first occurance of element with that class.
   * @returns {boolean}
   */
  Handsontable.Dom.isChildOf = function (child, parent) {
    var node = child.parentNode;
    var queriedParents = [];
    if (typeof parent === "string") {
      queriedParents = Array.prototype.slice.call(document.querySelectorAll(parent), 0);
    } else {
      queriedParents.push(parent);
    }

    while (node != null) {
      if (queriedParents.indexOf(node) > -1) {
        return true;
      }
      node = node.parentNode;
    }
    return false;
  };

  /**
   * Check if an element is part of `hot-table` web component.
   *
   * @param {Element} element
   * @returns {Boolean}
   */
  Handsontable.Dom.isChildOfWebComponentTable = function(element) {
    var hotTableName = 'hot-table',
        result = false,
        parentNode;

    parentNode = Handsontable.Dom.polymerWrap(element);

    function isHotTable(element) {
      return element.nodeType === Node.ELEMENT_NODE && element.nodeName === hotTableName.toUpperCase();
    }

    while (parentNode != null) {
      if (isHotTable(parentNode)) {
        result = true;
        break;
      }
      else if (parentNode.host && parentNode.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
        result = isHotTable(parentNode.host);

        if (result) {
          break;
        }
        parentNode = parentNode.host;
      }
      parentNode = parentNode.parentNode;
    }

    return result;
  };

  /**
   * Wrap element into polymer/webcomponent container if exists
   *
   * @param element
   * @returns {*}
   */
  Handsontable.Dom.polymerWrap = function(element) {
    /* global Polymer */
    return typeof Polymer !== 'undefined' && typeof wrap === 'function' ? wrap(element) : element;
  };

  /**
   * Unwrap element from polymer/webcomponent container if exists
   *
   * @param element
   * @returns {*}
   */
  Handsontable.Dom.polymerUnwrap = function(element) {
    /* global Polymer */
    return typeof Polymer !== 'undefined' && typeof unwrap === 'function' ? unwrap(element) : element;
  };

  /**
   * Checks if browser is support web components natively
   *
   * @returns {Boolean}
   */
  Handsontable.Dom.isWebComponentSupportedNatively = function() {
    var test = document.createElement('div');

    return test.createShadowRoot && test.createShadowRoot.toString().match(/\[native code\]/) ? true : false;
  };

  /**
   * Counts index of element within its parent
   * WARNING: for performance reasons, assumes there are only element nodes (no text nodes). This is true for Walkotnable
   * Otherwise would need to check for nodeType or use previousElementSibling
   * @see http://jsperf.com/sibling-index/10
   * @param {Element} elem
   * @return {Number}
   */
  Handsontable.Dom.index = function (elem) {
    var i = 0;
    if (elem.previousSibling) {
      /* jshint ignore:start */
      while (elem = elem.previousSibling) {
        ++i;
      }
      /* jshint ignore:end */
    }
    return i;
  };

  if (document.documentElement.classList) {
    var isSupportMultipleClassesArg = (function() {
      var element = document.createElement('div');

      element.classList.add('test', 'test2');

      return element.classList.contains('test2');
    }());

    /**
     * Checks if element has class name
     *
     * @param {HTMLElement} element
     * @param {String} className Class name to check
     * @returns {Boolean}
     */
    Handsontable.Dom.hasClass = function(element, className) {
      if (className === '') {
        return true;
      }
      return element.classList.contains(className);
    };

    /**
     * Add class name to an element
     *
     * @param {HTMLElement} element
     * @param {String|Array} className Class name as string or array of strings
     */
    Handsontable.Dom.addClass = function(element, className) {
      var len = 0;

      if (typeof className === 'string') {
        if (className === '') {
          return;
        }

        className = className.split(' ');
      }
      if (isSupportMultipleClassesArg) {
        element.classList.add.apply(element.classList, className);

      } else {
        while (className && className[len]) {
          if (className[len] === '') {
            continue;
          }

          element.classList.add(className[len]);
          len ++;
        }
      }
    };

    /**
     * Remove class name from an element
     *
     * @param {HTMLElement} element
     * @param {String|Array} className Class name as string or array of strings
     */
    Handsontable.Dom.removeClass = function(element, className) {
      var len = 0;

      if (typeof className === 'string') {
        if (className === '') {
          return;
        }

        className = className.split(' ');
      }
      if (isSupportMultipleClassesArg) {
        element.classList.remove.apply(element.classList, className);

      } else {
        while (className && className[len]) {
          if (className[len] === '') {
            continue;
          }

          element.classList.remove(className[len]);
          len ++;
        }
      }
    };

  } else {
    var createClassNameRegExp = function createClassNameRegExp(className) {
      return new RegExp('(\\s|^)' + className + '(\\s|$)');
    };

    /**
     * Checks if element has class name
     *
     * @param {HTMLElement} element
     * @param {String} className
     * @returns {Boolean}
     */
    Handsontable.Dom.hasClass = function(element, className) {
      // http://snipplr.com/view/3561/addclass-removeclass-hasclass/
      return element.className.match(createClassNameRegExp(className)) ? true : false;
    };

    /**
     * Add class name to an element
     *
     * @param {HTMLElement} element
     * @param {String|Array} className Class name as string or array of strings
     */
    Handsontable.Dom.addClass = function(element, className) {
      var len = 0, _className = element.className;

      if (typeof className === 'string') {
        className = className.split(' ');
      }
      if (_className === '') {
        _className = className.join(' ');

      } else {
        while (className[len]) {
          if (!createClassNameRegExp(className[len]).test(_className)) {
            _className += ' ' + className[len];
          }
          len ++;
        }
      }
      element.className = _className;
    };

    /**
     * Remove class name from an element
     *
     * @param {HTMLElement} element
     * @param {String|Array} className Class name as string or array of strings
     */
    Handsontable.Dom.removeClass = function(element, className) {
      var len = 0, _className = element.className;

      if (typeof className === 'string') {
        className = className.split(' ');
      }
      while (className[len]) {
        // String.prototype.trim is defined in polyfill.js
        _className = _className.replace(createClassNameRegExp(className[len]), ' ').trim();
        len ++;
      }
      if (element.className !== _className) {
        element.className = _className;
      }
    };
  }

  Handsontable.Dom.removeTextNodes = function (elem, parent) {
    if (elem.nodeType === 3) {
      parent.removeChild(elem); //bye text nodes!
    }
    else if (['TABLE', 'THEAD', 'TBODY', 'TFOOT', 'TR'].indexOf(elem.nodeName) > -1) {
      var childs = elem.childNodes;
      for (var i = childs.length - 1; i >= 0; i--) {
        this.removeTextNodes(childs[i], elem);
      }
    }
  };

  /**
   * Remove childs function
   * WARNING - this doesn't unload events and data attached by jQuery
   * http://jsperf.com/jquery-html-vs-empty-vs-innerhtml/9
   * http://jsperf.com/jquery-html-vs-empty-vs-innerhtml/11 - no siginificant improvement with Chrome remove() method
   * @param element
   * @returns {void}
   */
//
  Handsontable.Dom.empty = function (element) {
    var child;
    /* jshint ignore:start */
    while (child = element.lastChild) {
      element.removeChild(child);
    }
    /* jshint ignore:end */
  };

  Handsontable.Dom.HTML_CHARACTERS = /(<(.*)>|&(.*);)/;

  /**
   * Insert content into element trying avoid innerHTML method.
   * @return {void}
   */
  Handsontable.Dom.fastInnerHTML = function (element, content) {
    if (this.HTML_CHARACTERS.test(content)) {
      element.innerHTML = content;
    }
    else {
      this.fastInnerText(element, content);
    }
  };

  /**
   * Insert text content into element
   * @return {void}
   */
  if (document.createTextNode('test').textContent) { //STANDARDS
    Handsontable.Dom.fastInnerText = function (element, content) {
      var child = element.firstChild;
      if (child && child.nodeType === 3 && child.nextSibling === null) {
        //fast lane - replace existing text node
        //http://jsperf.com/replace-text-vs-reuse
        child.textContent = content;
      }
      else {
        //slow lane - empty element and insert a text node
        this.empty(element);
        element.appendChild(document.createTextNode(content));
      }
    };
  }
  else { //IE8
    Handsontable.Dom.fastInnerText = function (element, content) {
      var child = element.firstChild;
      if (child && child.nodeType === 3 && child.nextSibling === null) {
        //fast lane - replace existing text node
        //http://jsperf.com/replace-text-vs-reuse
        child.data = content;
      }
      else {
        //slow lane - empty element and insert a text node
        this.empty(element);
        element.appendChild(document.createTextNode(content));
      }
    };
  }

  /**
   * Returns true if element is attached to the DOM and visible, false otherwise
   * @param elem
   * @returns {boolean}
   */
  Handsontable.Dom.isVisible = function (elem) {
    var next = elem;

    while (Handsontable.Dom.polymerUnwrap(next) !== document.documentElement) { //until <html> reached
      if (next === null) { //parent detached from DOM
        return false;
      }
      else if (next.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
        if (next.host) { //this is Web Components Shadow DOM
          //see: http://w3c.github.io/webcomponents/spec/shadow/#encapsulation
          //according to spec, should be if (next.ownerDocument !== window.document), but that doesn't work yet
          if (next.host.impl) { //Chrome 33.0.1723.0 canary (2013-11-29) Web Platform features disabled
            return Handsontable.Dom.isVisible(next.host.impl);
          }
          else if (next.host) { //Chrome 33.0.1723.0 canary (2013-11-29) Web Platform features enabled
            return Handsontable.Dom.isVisible(next.host);
          }
          else {
            throw new Error("Lost in Web Components world");
          }
        }
        else {
          return false; //this is a node detached from document in IE8
        }
      }
      else if (next.style.display === 'none') {
        return false;
      }
      next = next.parentNode;
    }

    return true;
  };

  /**
   * Returns elements top and left offset relative to the document. Function is not compatible with jQuery offset.
   *
   * @param {HTMLElement} elem
   * @return {Object} Returns object with `top` and `left` props
   */
  Handsontable.Dom.offset = function (elem) {
    var offsetLeft,
        offsetTop,
        lastElem,
        docElem,
        box;

    docElem = document.documentElement;

    if (this.hasCaptionProblem() && elem.firstChild && elem.firstChild.nodeName === 'CAPTION') {
      // fixes problem with Firefox ignoring <caption> in TABLE offset (see also Handsontable.Dom.outerHeight)
      // http://jsperf.com/offset-vs-getboundingclientrect/8
      box = elem.getBoundingClientRect();

      return {
        top: box.top + (window.pageYOffset || docElem.scrollTop) - (docElem.clientTop || 0),
        left: box.left + (window.pageXOffset || docElem.scrollLeft) - (docElem.clientLeft || 0)
      };
    }
    offsetLeft = elem.offsetLeft;
    offsetTop = elem.offsetTop;
    lastElem = elem;

    /* jshint ignore:start */
    while (elem = elem.offsetParent) {
      // from my observation, document.body always has scrollLeft/scrollTop == 0
      if (elem === document.body) {
        break;
      }
      offsetLeft += elem.offsetLeft;
      offsetTop += elem.offsetTop;
      lastElem = elem;
    }
    /* jshint ignore:end */

    //slow - http://jsperf.com/offset-vs-getboundingclientrect/6
    if (lastElem && lastElem.style.position === 'fixed') {
      //if(lastElem !== document.body) { //faster but does gives false positive in Firefox
      offsetLeft += window.pageXOffset || docElem.scrollLeft;
      offsetTop += window.pageYOffset || docElem.scrollTop;
    }

    return {
      left: offsetLeft,
      top: offsetTop
    };
  };

  Handsontable.Dom.getWindowScrollTop = function () {
    var res = window.scrollY;
    if (res == void 0) { //IE8-11
      res = document.documentElement.scrollTop;
    }
    return res;
  };

  Handsontable.Dom.getWindowScrollLeft = function () {
    var res = window.scrollX;
    if (res == void 0) { //IE8-11
      res = document.documentElement.scrollLeft;
    }
    return res;
  };

  Handsontable.Dom.getScrollTop = function (elem) {
    if (elem === window) {
      return Handsontable.Dom.getWindowScrollTop(elem);
    }
    else {
      return elem.scrollTop;
    }
  };

  Handsontable.Dom.getScrollLeft = function (elem) {
    if (elem === window) {
      return Handsontable.Dom.getWindowScrollLeft(elem);
    }
    else {
      return elem.scrollLeft;
    }
  };

  Handsontable.Dom.getScrollableElement = function (element) {
    var el = element.parentNode,
        props = ['auto', 'scroll'],
        overflow, overflowX, overflowY,
        computedStyle = '',
        computedOverflow = '',
        computedOverflowY = '',
        computedOverflowX = '';

    while (el && el.style && document.body !== el) {
      overflow = el.style.overflow;
      overflowX = el.style.overflowX;
      overflowY = el.style.overflowY;

      if (overflow == 'scroll' || overflowX == 'scroll' || overflowY == 'scroll') {
        return el;
      } else if (window.getComputedStyle) {
        computedStyle = window.getComputedStyle(el);
        computedOverflow = computedStyle.getPropertyValue('overflow');
        computedOverflowY = computedStyle.getPropertyValue('overflow-y');
        computedOverflowX = computedStyle.getPropertyValue('overflow-x');

        if (computedOverflow === 'scroll' || computedOverflowX === 'scroll' || computedOverflowY === 'scroll') {
          return el;
        }
      }

      if (el.clientHeight <= el.scrollHeight && (props.indexOf(overflowY) !== -1 || props.indexOf(overflow) !== -1 ||
          props.indexOf(computedOverflow) !== -1 || props.indexOf(computedOverflowY) !== -1)) {
        return el;
      }
      if (el.clientWidth <= el.scrollWidth && (props.indexOf(overflowX) !== -1 || props.indexOf(overflow) !== -1 ||
          props.indexOf(computedOverflow) !== -1 || props.indexOf(computedOverflowX) !== -1)) {
        return el;
      }
      el = el.parentNode;
    }

    return window;
  };

  Handsontable.Dom.getTrimmingContainer = function (base) {
    var el = base.parentNode;
    while (el && el.style && document.body !== el) {
      if (el.style.overflow !== 'visible' && el.style.overflow !== '') {
        return el;
      } else if (window.getComputedStyle) {
        var computedStyle = window.getComputedStyle(el);
        if (computedStyle.getPropertyValue('overflow') !== 'visible' && computedStyle.getPropertyValue('overflow') !== '') {
          return el;
        }
      }

      el = el.parentNode;
    }
    return window;
  };

  Handsontable.Dom.getStyle = function (elem, prop) {
    if (!elem) {
      return;
    } else if (elem === window) {
      if (prop === 'width') {
        return window.innerWidth + 'px';
      } else if (prop === 'height') {
        return window.innerHeight + 'px';
      }
      return;
    }

    var styleProp = elem.style[prop],
        computedStyle;
    if (styleProp !== "" && styleProp !== void 0) {
      return styleProp;
    } else {
      computedStyle = Handsontable.Dom.getComputedStyle(elem);
      if (computedStyle.prop !== "" && computedStyle.prop !== void 0) {
        return computedStyle.prop;
      }
      return void 0;
    }
  };

  Handsontable.Dom.getComputedStyle = function (elem) {
    return elem.currentStyle || document.defaultView.getComputedStyle(elem);
  };

  Handsontable.Dom.outerWidth = function (elem) {
    return elem.offsetWidth;
  };

  Handsontable.Dom.outerHeight = function (elem) {
    if (this.hasCaptionProblem() && elem.firstChild && elem.firstChild.nodeName === 'CAPTION') {
      //fixes problem with Firefox ignoring <caption> in TABLE.offsetHeight
      //jQuery (1.10.1) still has this unsolved
      //may be better to just switch to getBoundingClientRect
      //http://bililite.com/blog/2009/03/27/finding-the-size-of-a-table/
      //http://lists.w3.org/Archives/Public/www-style/2009Oct/0089.html
      //http://bugs.jquery.com/ticket/2196
      //http://lists.w3.org/Archives/Public/www-style/2009Oct/0140.html#start140
      return elem.offsetHeight + elem.firstChild.offsetHeight;
    }
    else {
      return elem.offsetHeight;
    }
  };

  Handsontable.Dom.innerHeight = function (elem) {
    return elem.clientHeight || elem.innerHeight;
  };

  Handsontable.Dom.innerWidth = function (elem) {
    return elem.clientWidth || elem.innerWidth;
  };

  Handsontable.Dom.addEvent = function (element, event, callback) {
    if (window.addEventListener) {
      element.addEventListener(event, callback, false);
    } else {
      element.attachEvent('on' + event, callback);
    }
  };

  Handsontable.Dom.removeEvent = function (element, event, callback) {
    if (window.removeEventListener) {
      element.removeEventListener(event, callback, false);
    } else {
      element.detachEvent('on' + event, callback);
    }
  };


  (function () {
    var hasCaptionProblem;

    function detectCaptionProblem() {
      var TABLE = document.createElement('TABLE');
      TABLE.style.borderSpacing = 0;
      TABLE.style.borderWidth = 0;
      TABLE.style.padding = 0;
      var TBODY = document.createElement('TBODY');
      TABLE.appendChild(TBODY);
      TBODY.appendChild(document.createElement('TR'));
      TBODY.firstChild.appendChild(document.createElement('TD'));
      TBODY.firstChild.firstChild.innerHTML = '<tr><td>t<br>t</td></tr>';

      var CAPTION = document.createElement('CAPTION');
      CAPTION.innerHTML = 'c<br>c<br>c<br>c';
      CAPTION.style.padding = 0;
      CAPTION.style.margin = 0;
      TABLE.insertBefore(CAPTION, TBODY);

      document.body.appendChild(TABLE);
      hasCaptionProblem = (TABLE.offsetHeight < 2 * TABLE.lastChild.offsetHeight); //boolean
      document.body.removeChild(TABLE);
    }

    Handsontable.Dom.hasCaptionProblem = function () {
      if (hasCaptionProblem === void 0) {
        detectCaptionProblem();
      }
      return hasCaptionProblem;
    };

    /**
     * Returns caret position in text input
     * @author http://stackoverflow.com/questions/263743/how-to-get-caret-position-in-textarea
     * @return {Number}
     */
    Handsontable.Dom.getCaretPosition = function (el) {
      if (el.selectionStart) {
        return el.selectionStart;
      }
      else if (document.selection) { //IE8
        el.focus();
        var r = document.selection.createRange();
        if (r == null) {
          return 0;
        }
        var re = el.createTextRange(),
            rc = re.duplicate();
        re.moveToBookmark(r.getBookmark());
        rc.setEndPoint('EndToStart', re);
        return rc.text.length;
      }
      return 0;
    };

    /**
     * Returns end of the selection in text input
     * @return {Number}
     */
    Handsontable.Dom.getSelectionEndPosition = function (el) {
      if (el.selectionEnd) {
        return el.selectionEnd;
      } else if (document.selection) { //IE8
        var r = document.selection.createRange();
        if (r == null) {
          return 0;
        }
        var re = el.createTextRange();

        return re.text.indexOf(r.text) + r.text.length;
      }
    };

    /**
     * Sets caret position in text input
     * @author http://blog.vishalon.net/index.php/javascript-getting-and-setting-caret-position-in-textarea/
     * @param {Element} el
     * @param {Number} pos
     * @param {Number} endPos
     */
    Handsontable.Dom.setCaretPosition = function (el, pos, endPos) {
      if (endPos === void 0) {
        endPos = pos;
      }
      if (el.setSelectionRange) {
        el.focus();
        el.setSelectionRange(pos, endPos);
      }
      else if (el.createTextRange) { //IE8
        var range = el.createTextRange();
        range.collapse(true);
        range.moveEnd('character', endPos);
        range.moveStart('character', pos);
        range.select();
      }
    };

    var cachedScrollbarWidth;
    //http://stackoverflow.com/questions/986937/how-can-i-get-the-browsers-scrollbar-sizes
    function walkontableCalculateScrollbarWidth() {
      var inner = document.createElement('p');
      inner.style.width = "100%";
      inner.style.height = "200px";

      var outer = document.createElement('div');
      outer.style.position = "absolute";
      outer.style.top = "0px";
      outer.style.left = "0px";
      outer.style.visibility = "hidden";
      outer.style.width = "200px";
      outer.style.height = "150px";
      outer.style.overflow = "hidden";
      outer.appendChild(inner);

      (document.body || document.documentElement).appendChild(outer);
      var w1 = inner.offsetWidth;
      outer.style.overflow = 'scroll';
      var w2 = inner.offsetWidth;
      if (w1 == w2) {
        w2 = outer.clientWidth;
      }

      (document.body || document.documentElement).removeChild(outer);

      return (w1 - w2);
    }

    /**
     * Returns the computed width of the native browser scroll bar
     * @return {Number} width
     */
    Handsontable.Dom.getScrollbarWidth = function (mockWidth) {
      if (cachedScrollbarWidth === void 0) {
        cachedScrollbarWidth = walkontableCalculateScrollbarWidth();
      }

      if(mockWidth && cachedScrollbarWidth === 0) {
        return 30;
      }

      return cachedScrollbarWidth;
    };

    var isIE8 = !(document.createTextNode('test').textContent);
    Handsontable.Dom.isIE8 = function () {
      return isIE8;
    };

    var isIE9 = !!(document.documentMode);
    Handsontable.Dom.isIE9 = function () {
      return isIE9;
    };

    var isSafari = (/Safari/.test(navigator.userAgent) && /Apple Computer/.test(navigator.vendor));
    Handsontable.Dom.isSafari = function () {
      return isSafari;
    };

    /**
     * Sets overlay position depending on it's type and used browser
     */
    Handsontable.Dom.setOverlayPosition = function (overlayElem, left, top) {
      if (isIE8 || isIE9) {
        overlayElem.style.top = top;
        overlayElem.style.left = left;
      } else if (isSafari) {
        overlayElem.style['-webkit-transform'] = 'translate3d(' + left + ',' + top + ',0)';
      } else {
        overlayElem.style['transform'] = 'translate3d(' + left + ',' + top + ',0)';
      }
    };

    Handsontable.Dom.getCssTransform = function (elem) {
      var transform;

      /* jshint ignore:start */
      if (elem.style['transform'] && (transform = elem.style['transform']) != "") {
        return ['transform', transform];
      } else if (elem.style['-webkit-transform'] && (transform = elem.style['-webkit-transform']) != "") {
        return ['-webkit-transform', transform];
      } else {
        return -1;
      }
      /* jshint ignore:end */
    };

    Handsontable.Dom.resetCssTransform = function (elem) {
      /* jshint ignore:start */
      if (elem['transform'] && elem['transform'] != "") {
        elem['transform'] = "";
      } else if (elem['-webkit-transform'] && elem['-webkit-transform'] != "") {
        elem['-webkit-transform'] = "";
      }
      /* jshint ignore:end */
    };

  })();


  if(!window.Handsontable){
    var Handsontable = {};
  }

  Handsontable.countEventManagerListeners = 0; //used to debug memory leaks

  Handsontable.eventManager = function (instance) {
    var
        addEvent,
        removeEvent,
        clearEvents,
        fireEvent;

    if (!instance) {
      throw new Error ('instance not defined');
    }
    if (!instance.eventListeners) {
      instance.eventListeners = [];
    }

    function extendEvent(event) {
      var
          componentName = 'HOT-TABLE',
          isHotTableSpotted,
          fromElement,
          realTarget,
          target,
          len;

      event.isTargetWebComponent = false;
      event.realTarget = event.target;

      if (!Handsontable.eventManager.isHotTableEnv) {
        return event;
      }
      event = Handsontable.Dom.polymerWrap(event);
      len = event.path.length;

      while (len --) {
        if (event.path[len].nodeName === componentName) {
          isHotTableSpotted = true;

        } else if (isHotTableSpotted && event.path[len].shadowRoot) {
          target = event.path[len];

          break;
        }
        if (len === 0 && !target) {
          target = event.path[len];
        }
      }
      if (!target) {
        target = event.target;
      }
      event.isTargetWebComponent = true;

      if (Handsontable.Dom.isWebComponentSupportedNatively()) {
        event.realTarget = event.srcElement || event.toElement;

      } else if (instance instanceof Handsontable.Core || instance instanceof Walkontable) {
        // Polymer doesn't support `event.target` property properly we must emulate it ourselves
        if (instance instanceof Handsontable.Core) {
          fromElement = instance.view.wt.wtTable.TABLE;

        } else if (instance instanceof Walkontable) {
          // .wtHider
          fromElement = instance.wtTable.TABLE.parentNode.parentNode;
        }
        realTarget = Handsontable.Dom.closest(event.target, [componentName], fromElement);

        if (realTarget) {
          event.realTarget = fromElement.querySelector(componentName) || event.target;
        } else {
          event.realTarget = event.target;
        }
      }

      Object.defineProperty(event, 'target', {
        get: function() {
          return Handsontable.Dom.polymerWrap(target);
        },
        enumerable: true,
        configurable: true
      });

      return event;
    }

    /**
     * Add Event
     *
     * @param {Element} element
     * @param {String} event
     * @param {Function} callback
     * @returns {Function} Returns function which you can easily call to remove that event
     */
    addEvent = function (element, event, callback) {
      var callbackProxy;

      callbackProxy = function callbackProxy(event) {
        if (event.target == void 0 && event.srcElement != void 0) {
          if (event.definePoperty) {
            event.definePoperty('target', {
              value: event.srcElement
            });
          } else {
            event.target = event.srcElement;
          }
        }
        if (event.preventDefault == void 0) {
          if (event.definePoperty) {
            event.definePoperty('preventDefault', {
              value: function() {
                this.returnValue = false;
              }
            });
          } else {
            event.preventDefault = function () {
              this.returnValue = false;
            };
          }
        }
        event = extendEvent(event);

        callback.call(this, event);
      };

      instance.eventListeners.push({
        element: element,
        event: event,
        callback: callback,
        callbackProxy: callbackProxy
      });

      if (window.addEventListener) {
        element.addEventListener(event, callbackProxy, false);
      } else {
        element.attachEvent('on' + event, callbackProxy);
      }
      Handsontable.countEventManagerListeners ++;

      return function _removeEvent() {
        removeEvent(element, event, callback);
      };
    };

    /**
     * Remove event
     *
     * @param {Element} element
     * @param {String} event
     * @param {Function} callback
     */
    removeEvent = function (element, event, callback) {
      var len = instance.eventListeners.length,
          tmpEvent;

      while (len--) {
        tmpEvent = instance.eventListeners[len];

        if (tmpEvent.event == event && tmpEvent.element == element) {
          if (callback && callback != tmpEvent.callback) {
            continue;
          }
          instance.eventListeners.splice(len, 1);

          if (tmpEvent.element.removeEventListener) {
            tmpEvent.element.removeEventListener(tmpEvent.event, tmpEvent.callbackProxy, false);
          } else {
            tmpEvent.element.detachEvent('on' + tmpEvent.event, tmpEvent.callbackProxy);
          }
          Handsontable.countEventManagerListeners --;
        }
      }
    };

    /**
     * Clear all events
     */
    clearEvents = function () {
      var len = instance.eventListeners.length,
          event;

      while (len--) {
        event = instance.eventListeners[len];

        if (event) {
          removeEvent(event.element, event.event, event.callback);
        }
      }
    };

    /**
     * Trigger event
     *
     * @param {Element} element
     * @param {String} type
     */
    fireEvent = function (element, type) {
      var options, event;

      options = {
        bubbles: true,
        cancelable: (type !== "mousemove"),
        view: window,
        detail: 0,
        screenX: 0,
        screenY: 0,
        clientX: 1,
        clientY: 1,
        ctrlKey: false,
        altKey: false,
        shiftKey: false,
        metaKey: false,
        button: 0,
        relatedTarget: undefined
      };

      if (document.createEvent) {
        event = document.createEvent("MouseEvents");
        event.initMouseEvent(type, options.bubbles, options.cancelable,
            options.view, options.detail,
            options.screenX, options.screenY, options.clientX, options.clientY,
            options.ctrlKey, options.altKey, options.shiftKey, options.metaKey,
            options.button, options.relatedTarget || document.body.parentNode);

      } else {
        event = document.createEventObject();
      }

      if (element.dispatchEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent('on' + type, event);
      }
    };

    return {
      addEventListener: addEvent,
      removeEventListener: removeEvent,
      clear: clearEvents,
      fireEvent: fireEvent
    };
  };

  /**
   * Handsontable TableView constructor
   * @param {Object} instance
   */
  Handsontable.TableView = function (instance) {
    var that = this;

    this.eventManager = Handsontable.eventManager(instance);
    this.instance = instance;
    this.settings = instance.getSettings();


    var originalStyle = instance.rootElement.getAttribute('style');
    if(originalStyle) {
      instance.rootElement.setAttribute('data-originalstyle', originalStyle); //needed to retrieve original style in jsFiddle link generator in HT examples. may be removed in future versions
    }

    Handsontable.Dom.addClass(instance.rootElement,'handsontable');
//  instance.rootElement.addClass('handsontable');

    var table = document.createElement('TABLE');
    table.className = 'htCore';
    this.THEAD = document.createElement('THEAD');
    table.appendChild(this.THEAD);
    this.TBODY = document.createElement('TBODY');
    table.appendChild(this.TBODY);

    instance.table = table;


    instance.container.insertBefore(table, instance.container.firstChild);

    this.eventManager.addEventListener(instance.rootElement,'mousedown', function (event) {
      if (!that.isTextSelectionAllowed(event.target)) {
        clearTextSelection();
        event.preventDefault();
        window.focus(); //make sure that window that contains HOT is active. Important when HOT is in iframe.
      }
    });

    this.eventManager.addEventListener(document.documentElement, 'keyup',function (event) {
      if (instance.selection.isInProgress() && !event.shiftKey) {
        instance.selection.finish();
      }
    });

    var isMouseDown;
    this.isMouseDown = function () {
      return isMouseDown;
    };

    this.eventManager.addEventListener(document.documentElement, 'mouseup', function (event) {
      if (instance.selection.isInProgress() && event.which === 1) { //is left mouse button
        instance.selection.finish();
      }

      isMouseDown = false;

      if (Handsontable.helper.isOutsideInput(document.activeElement)) {
        instance.unlisten();
      }
    });

    this.eventManager.addEventListener(document.documentElement, 'mousedown',function (event) {
      var next = event.target;

      if (isMouseDown) {
        return; // it must have been started in a cell
      }

      // immediate click on "spreader" means click on the right side of vertical scrollbar
      if (next !== instance.view.wt.wtTable.holder) {
        while (next !== document.documentElement) {
          if (next === null) {
            if (event.isTargetWebComponent) {
              break;
            }
            // click on something that was a row but now is detached (possibly because your click triggered a rerender)
            return;
          }
          if (next === instance.rootElement) {
            // click inside container
            return;
          }
          next = next.parentNode;
        }
      }

      // function did not return until here, we have an outside click!
      if (that.settings.outsideClickDeselects) {
        instance.deselectCell();
      }
      else {
        instance.destroyEditor();
      }
    });



    this.eventManager.addEventListener(table, 'selectstart', function (event) {
      if (that.settings.fragmentSelection) {
        return;
      }

      //https://github.com/handsontable/handsontable/issues/160
      //selectstart is IE only event. Prevent text from being selected when performing drag down in IE8
      event.preventDefault();
    });

    var clearTextSelection = function () {
      //http://stackoverflow.com/questions/3169786/clear-text-selection-with-javascript
      if (window.getSelection) {
        if (window.getSelection().empty) {  // Chrome
          window.getSelection().empty();
        } else if (window.getSelection().removeAllRanges) {  // Firefox
          window.getSelection().removeAllRanges();
        }
      } else if (document.selection) {  // IE?
        document.selection.empty();
      }
    };

    var selections = [
      new WalkontableSelection({
        className: 'current',
        border: {
          width: 2,
          color: '#5292F7',
          //style: 'solid', //not used
          cornerVisible: function () {
            return that.settings.fillHandle && !that.isCellEdited() && !instance.selection.isMultiple();
          },
          multipleSelectionHandlesVisible: function () {
            return !that.isCellEdited() && !instance.selection.isMultiple();
          }
        }
      }),
      new WalkontableSelection({
        className: 'area',
        border: {
          width: 1,
          color: '#89AFF9',
          //style: 'solid', // not used
          cornerVisible: function () {
            return that.settings.fillHandle && !that.isCellEdited() && instance.selection.isMultiple();
          },
          multipleSelectionHandlesVisible: function () {
            return !that.isCellEdited() && instance.selection.isMultiple();
          }
        }
      }),
      new WalkontableSelection({
        className: 'highlight',
        highlightRowClassName: that.settings.currentRowClassName,
        highlightColumnClassName: that.settings.currentColClassName
      }),
      new WalkontableSelection({
        className: 'fill',
        border: {
          width: 1,
          color: 'red'
          //style: 'solid' // not used
        }
      })
    ];
    selections.current = selections[0];
    selections.area = selections[1];
    selections.highlight = selections[2];
    selections.fill = selections[3];

    var walkontableConfig = {
      debug: function () {
        return that.settings.debug;
      },
      table: table,
      stretchH: this.settings.stretchH,
      data: instance.getDataAtCell,
      totalRows: instance.countRows,
      totalColumns: instance.countCols,
      fixedColumnsLeft: function () {
        return that.settings.fixedColumnsLeft;
      },
      fixedRowsTop: function () {
        return that.settings.fixedRowsTop;
      },
      renderAllRows: that.settings.renderAllRows,
      rowHeaders: function () {
        var arr = [];
        if(instance.hasRowHeaders()) {
          arr.push(function (index, TH) {
            that.appendRowHeader(index, TH);
          });
        }
        Handsontable.hooks.run(instance, 'afterGetRowHeaderRenderers', arr);
        return arr;
      },
      columnHeaders: function () {

        var arr = [];
        if(instance.hasColHeaders()) {
          arr.push(function (index, TH) {
            that.appendColHeader(index, TH);
          });
        }
        Handsontable.hooks.run(instance, 'afterGetColumnHeaderRenderers', arr);
        return arr;
      },
      columnWidth: instance.getColWidth,
      rowHeight: instance.getRowHeight,
      cellRenderer: function (row, col, TD) {

        var prop = that.instance.colToProp(col)
            , cellProperties = that.instance.getCellMeta(row, col)
            , renderer = that.instance.getCellRenderer(cellProperties);

        var value = that.instance.getDataAtRowProp(row, prop);

        renderer(that.instance, TD, row, col, prop, value, cellProperties);
        Handsontable.hooks.run(that.instance, 'afterRenderer', TD, row, col, prop, value, cellProperties);

      },
      selections: selections,
      hideBorderOnMouseDownOver: function () {
        return that.settings.fragmentSelection;
      },
      onCellMouseDown: function (event, coords, TD, wt) {
        instance.listen();
        that.activeWt = wt;

        isMouseDown = true;

        Handsontable.Dom.enableImmediatePropagation(event);

        Handsontable.hooks.run(instance, 'beforeOnCellMouseDown', event, coords, TD);

        if (!event.isImmediatePropagationStopped()) {

          if (event.button === 2 && instance.selection.inInSelection(coords)) { //right mouse button
            //do nothing
          }
          else if (event.shiftKey) {
            if (coords.row >= 0 && coords.col >= 0) {
              instance.selection.setRangeEnd(coords);
            }
          }
          else {
            if ((coords.row < 0 || coords.col < 0) && (coords.row >= 0 || coords.col >= 0)) {
              if (coords.row < 0) {
                instance.selectCell(0, coords.col, instance.countRows() - 1, coords.col);
                instance.selection.setSelectedHeaders(false, true);
              }
              if (coords.col < 0) {
                instance.selectCell(coords.row, 0, coords.row, instance.countCols() - 1);
                instance.selection.setSelectedHeaders(true, false);
              }
            }
            else {
              coords.row = coords.row < 0 ? 0 : coords.row;
              coords.col = coords.col < 0 ? 0 : coords.col;

              instance.selection.setRangeStart(coords);
            }
          }

          Handsontable.hooks.run(instance, 'afterOnCellMouseDown', event, coords, TD);

          that.activeWt = that.wt;
        }
      },
      /*onCellMouseOut: function (/*event, coords, TD* /) {
       if (isMouseDown && that.settings.fragmentSelection === 'single') {
       clearTextSelection(); //otherwise text selection blinks during multiple cells selection
       }
       },*/
      onCellMouseOver: function (event, coords, TD, wt) {
        that.activeWt = wt;
        if (coords.row >= 0 && coords.col >= 0) { //is not a header
          if (isMouseDown) {
            /*if (that.settings.fragmentSelection === 'single') {
             clearTextSelection(); //otherwise text selection blinks during multiple cells selection
             }*/
            instance.selection.setRangeEnd(coords);
          }
        } else {
          if (isMouseDown) {
            // multi select columns
            if (coords.row < 0) {
              instance.selection.setRangeEnd(new WalkontableCellCoords(instance.countRows() - 1, coords.col));
              instance.selection.setSelectedHeaders(false, true);
            }

            // multi select rows
            if (coords.col < 0) {
              instance.selection.setRangeEnd(new WalkontableCellCoords(coords.row, instance.countCols() - 1));
              instance.selection.setSelectedHeaders(true, false);
            }
          }
        }

        Handsontable.hooks.run(instance, 'afterOnCellMouseOver', event, coords, TD);
        that.activeWt = that.wt;
      },
      onCellCornerMouseDown: function (event) {
        event.preventDefault();
        Handsontable.hooks.run(instance, 'afterOnCellCornerMouseDown', event);
      },
      beforeDraw: function (force) {
        that.beforeRender(force);
      },
      onDraw: function (force) {
        that.onDraw(force);
      },
      onScrollVertically: function () {
        instance.runHooks('afterScrollVertically');
      },
      onScrollHorizontally: function () {
        instance.runHooks('afterScrollHorizontally');
      },
      onBeforeDrawBorders: function (corners, borderClassName) {
        instance.runHooks('beforeDrawBorders', corners, borderClassName);
      },
      onBeforeTouchScroll: function () {
        instance.runHooks('beforeTouchScroll');
      },
      onAfterMomentumScroll: function () {
        instance.runHooks('afterMomentumScroll');
      },
      viewportRowCalculatorOverride: function (calc) {
        if (that.settings.viewportRowRenderingOffset) {
          calc.startRow = Math.max(calc.startRow - that.settings.viewportRowRenderingOffset, 0);
          calc.endRow = Math.min(calc.endRow + that.settings.viewportRowRenderingOffset, instance.countRows() - 1);
        }
        instance.runHooks('afterViewportRowCalculatorOverride', calc);
      },
      viewportColumnCalculatorOverride: function (calc) {
        if (that.settings.viewportColumnRenderingOffset) {
          calc.startColumn = Math.max(calc.startColumn - that.settings.viewportColumnRenderingOffset, 0);
          calc.endColumn = Math.min(calc.endColumn + that.settings.viewportColumnRenderingOffset, instance.countCols() - 1);
        }
        instance.runHooks('afterViewportColumnCalculatorOverride', calc);
      }
    };

    Handsontable.hooks.run(instance, 'beforeInitWalkontable', walkontableConfig);

    this.wt = new Walkontable(walkontableConfig);
    this.activeWt = this.wt;

    this.eventManager.addEventListener(that.wt.wtTable.spreader, 'mousedown', function (event) {
      if (event.target === that.wt.wtTable.spreader && event.which === 3) { //right mouse button exactly on spreader means right clickon the right hand side of vertical scrollbar
        Handsontable.helper.stopPropagation(event);
        //event.stopPropagation();
      }
    });

    this.eventManager.addEventListener(that.wt.wtTable.spreader, 'contextmenu', function (event) {
      if (event.target === that.wt.wtTable.spreader && event.which === 3) { //right mouse button exactly on spreader means right clickon the right hand side of vertical scrollbar
        Handsontable.helper.stopPropagation(event);
        //event.stopPropagation();
      }
    });


    this.eventManager.addEventListener(document.documentElement, 'click', function () {
      if (that.settings.observeDOMVisibility) {
        if (that.wt.drawInterrupted) {
          that.instance.forceFullRender = true;
          that.render();
        }
      }
    });
  };

  Handsontable.TableView.prototype.isTextSelectionAllowed = function (el) {
    if (Handsontable.helper.isInput(el)) {
      return (true);
    }
    if (this.settings.fragmentSelection && Handsontable.Dom.isChildOf(el, this.TBODY)) {
      return (true);
    }
    return false;
  };

  Handsontable.TableView.prototype.isCellEdited = function () {
    var activeEditor = this.instance.getActiveEditor();
    return activeEditor && activeEditor.isOpened();
  };

  Handsontable.TableView.prototype.beforeRender = function (force) {
    if (force) { //force = did Walkontable decide to do full render
      Handsontable.hooks.run(this.instance, 'beforeRender', this.instance.forceFullRender); //this.instance.forceFullRender = did Handsontable request full render?
    }
  };

  Handsontable.TableView.prototype.onDraw = function (force) {
    if (force) { //force = did Walkontable decide to do full render
      Handsontable.hooks.run(this.instance, 'afterRender', this.instance.forceFullRender); //this.instance.forceFullRender = did Handsontable request full render?
    }
  };

  Handsontable.TableView.prototype.render = function () {
    this.wt.draw(!this.instance.forceFullRender);
    this.instance.forceFullRender = false;
//  this.instance.rootElement.triggerHandler('render.handsontable');
  };

  /**
   * Returns td object given coordinates
   * @param {WalkontableCellCoords} coords
   * @param {Boolean} topmost
   */
  Handsontable.TableView.prototype.getCellAtCoords = function (coords, topmost) {
    var td = this.wt.getCell(coords, topmost);
    //var td = this.wt.wtTable.getCell(coords);
    if (td < 0) { //there was an exit code (cell is out of bounds)
      return null;
    }
    else {
      return td;
    }
  };

  /**
   * Scroll viewport to selection
   * @param {WalkontableCellCoords} coords
   */
  Handsontable.TableView.prototype.scrollViewport = function (coords) {
    this.wt.scrollViewport(coords);
  };

  /**
   * Append row header to a TH element
   * @param row
   * @param TH
   */
  Handsontable.TableView.prototype.appendRowHeader = function (row, TH) {
    var DIV = document.createElement('DIV'),
        SPAN = document.createElement('SPAN');

    DIV.className = 'relative';
    SPAN.className = 'rowHeader';

    if (row > -1) {
      Handsontable.Dom.fastInnerHTML(SPAN, this.instance.getRowHeader(row));
    } else {
      Handsontable.Dom.fastInnerText(SPAN, String.fromCharCode(160)); // workaround for https://github.com/handsontable/handsontable/issues/1946
    }

    DIV.appendChild(SPAN);
    Handsontable.Dom.empty(TH);

    TH.appendChild(DIV);

    Handsontable.hooks.run(this.instance, 'afterGetRowHeader', row, TH);
  };

  /**
   * Append column header to a TH element
   * @param col
   * @param TH
   */
  Handsontable.TableView.prototype.appendColHeader = function (col, TH) {
    var DIV = document.createElement('DIV')
        , SPAN = document.createElement('SPAN');

    DIV.className = 'relative';
    SPAN.className = 'colHeader';

    if (col > -1) {
      Handsontable.Dom.fastInnerHTML(SPAN, this.instance.getColHeader(col));
    } else {
      Handsontable.Dom.fastInnerText(SPAN, String.fromCharCode(160)); // workaround for https://github.com/handsontable/handsontable/issues/1946
      Handsontable.Dom.addClass(SPAN, 'cornerHeader');
    }
    DIV.appendChild(SPAN);

    Handsontable.Dom.empty(TH);
    TH.appendChild(DIV);
    Handsontable.hooks.run(this.instance, 'afterGetColHeader', col, TH);
  };

  /**
   * Given a element's left position relative to the viewport, returns maximum element width until the right edge of the viewport (before scrollbar)
   * @param {Number} leftOffset
   * @return {Number}
   */
  Handsontable.TableView.prototype.maximumVisibleElementWidth = function (leftOffset) {
    var workspaceWidth = this.wt.wtViewport.getWorkspaceWidth();
    var maxWidth = workspaceWidth - leftOffset;
    return maxWidth > 0 ? maxWidth : 0;
  };

  /**
   * Given a element's top position relative to the viewport, returns maximum element height until the bottom edge of the viewport (before scrollbar)
   * @param {Number} topOffset
   * @return {Number}
   */
  Handsontable.TableView.prototype.maximumVisibleElementHeight = function (topOffset) {
    var workspaceHeight = this.wt.wtViewport.getWorkspaceHeight();
    var maxHeight = workspaceHeight - topOffset;
    return maxHeight > 0 ? maxHeight : 0;
  };

  Handsontable.TableView.prototype.mainViewIsActive = function () {
    return this.wt === this.activeWt;
  };

  Handsontable.TableView.prototype.destroy = function () {
    this.wt.destroy();
    this.eventManager.clear();
  };

  /**
   * Utility to register editors and common namespace for keeping reference to all editor classes
   */
  (function (Handsontable) {
    'use strict';

    function RegisteredEditor(editorClass) {
      var Clazz, instances;

      instances = {};
      Clazz = editorClass;

      this.getInstance = function (hotInstance) {
        if (!(hotInstance.guid in instances)) {
          instances[hotInstance.guid] = new Clazz(hotInstance);
        }

        return instances[hotInstance.guid];
      };

    }

    var registeredEditorNames = {};
    var registeredEditorClasses = new WeakMap();

    Handsontable.editors = {

      /**
       * Registers editor under given name
       * @param {String} editorName
       * @param {Function} editorClass
       */
      registerEditor: function (editorName, editorClass) {
        var editor = new RegisteredEditor(editorClass);
        if (typeof editorName === "string") {
          registeredEditorNames[editorName] = editor;
        }
        registeredEditorClasses.set(editorClass, editor);
      },

      /**
       * Returns instance (singleton) of editor class
       * @param {String|Function} editorName/editorClass
       * @returns {Function} editorClass
       */
      getEditor: function (editorName, hotInstance) {
        var editor;
        if (typeof editorName == 'function') {
          if (!(registeredEditorClasses.get(editorName))) {
            this.registerEditor(null, editorName);
          }
          editor = registeredEditorClasses.get(editorName);
        }
        else if (typeof editorName == 'string') {
          editor = registeredEditorNames[editorName];
        }
        else {
          throw Error('Only strings and functions can be passed as "editor" parameter ');
        }

        if (!editor) {
          throw Error('No editor registered under name "' + editorName + '"');
        }

        return editor.getInstance(hotInstance);
      }

    };


  })(Handsontable);

  (function(Handsontable){
    'use strict';

    /**
     * @param {Object} instance Instance of Handsontable
     * @param {*} priv
     * @param {*} selection
     * @util
     * @class Handsontable.EditorManager
     */
    Handsontable.EditorManager = function(instance, priv, selection){
      var _this = this,
          keyCodes = Handsontable.helper.keyCode,
          destroyed = false,
          eventManager,
          activeEditor;

      eventManager = Handsontable.eventManager(instance);

      function moveSelectionAfterEnter(shiftKey) {
        var enterMoves = typeof priv.settings.enterMoves === 'function' ? priv.settings.enterMoves(event) : priv.settings.enterMoves;

        if (shiftKey) {
          // move selection up
          selection.transformStart(- enterMoves.row, - enterMoves.col);

        }  else {
          // move selection down (add a new row if needed)
          selection.transformStart(enterMoves.row, enterMoves.col, true);
        }
      }

      function moveSelectionUp(shiftKey) {
        if (shiftKey) {
          selection.transformEnd(-1, 0);
        } else {
          selection.transformStart(-1, 0);
        }
      }

      function moveSelectionDown(shiftKey) {
        if (shiftKey) {
          // expanding selection down with shift
          selection.transformEnd(1, 0);
        } else {
          // move selection down
          selection.transformStart(1, 0);
        }
      }

      function moveSelectionRight(shiftKey) {
        if (shiftKey) {
          selection.transformEnd(0, 1);
        } else {
          selection.transformStart(0, 1);
        }
      }

      function moveSelectionLeft(shiftKey) {
        if (shiftKey) {
          selection.transformEnd(0, -1);
        }
        else {
          selection.transformStart(0, -1);
        }
      }

      function onKeyDown(event) {
        var ctrlDown, rangeModifier;

        if (!instance.isListening()) {
          return;
        }
        Handsontable.hooks.run(instance, 'beforeKeyDown', event);

        if (destroyed) {
          return;
        }
        Handsontable.Dom.enableImmediatePropagation(event);

        if (event.isImmediatePropagationStopped()) {
          return;
        }
        priv.lastKeyCode = event.keyCode;

        if (!selection.isSelected()) {
          return;
        }
        // catch CTRL but not right ALT (which in some systems triggers ALT+CTRL)
        ctrlDown = (event.ctrlKey || event.metaKey) && !event.altKey;

        if (activeEditor && !activeEditor.isWaiting()) {
          if (!Handsontable.helper.isMetaKey(event.keyCode) && !ctrlDown && !_this.isEditorOpened()) {
            _this.openEditor("", event);

            return;
          }
        }
        rangeModifier = event.shiftKey ? selection.setRangeEnd : selection.setRangeStart;

        switch (event.keyCode) {

          case keyCodes.A:
            if (ctrlDown) {
              selection.selectAll(); //select all cells

              event.preventDefault();
              Handsontable.helper.stopPropagation(event);
              //event.stopPropagation();
            }
            break;

          case keyCodes.ARROW_UP:
            if (_this.isEditorOpened() && activeEditor && !activeEditor.isWaiting()){
              _this.closeEditorAndSaveChanges(ctrlDown);
            }
            moveSelectionUp(event.shiftKey);

            event.preventDefault();
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.ARROW_DOWN:
            if (_this.isEditorOpened() && activeEditor && !activeEditor.isWaiting()){
              _this.closeEditorAndSaveChanges(ctrlDown);
            }
            moveSelectionDown(event.shiftKey);

            event.preventDefault();
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.ARROW_RIGHT:
            if(_this.isEditorOpened()  && activeEditor && !activeEditor.isWaiting()){
              _this.closeEditorAndSaveChanges(ctrlDown);
            }
            moveSelectionRight(event.shiftKey);

            event.preventDefault();
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.ARROW_LEFT:
            if(_this.isEditorOpened() && activeEditor && !activeEditor.isWaiting()){
              _this.closeEditorAndSaveChanges(ctrlDown);
            }
            moveSelectionLeft(event.shiftKey);

            event.preventDefault();
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.TAB:
            var tabMoves = typeof priv.settings.tabMoves === 'function' ? priv.settings.tabMoves(event) : priv.settings.tabMoves;

            if (event.shiftKey) {
              selection.transformStart(-tabMoves.row, -tabMoves.col); //move selection left
            }
            else {
              selection.transformStart(tabMoves.row, tabMoves.col, true); //move selection right (add a new column if needed)
            }
            event.preventDefault();
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.BACKSPACE:
          case keyCodes.DELETE:
            selection.empty(event);
            _this.prepareEditor();
            event.preventDefault();
            break;

          case keyCodes.F2: /* F2 */
            _this.openEditor(null, event);
            event.preventDefault(); //prevent Opera from opening Go to Page dialog
            break;

          case keyCodes.ENTER: /* return/enter */
            if(_this.isEditorOpened()){

              if (activeEditor && activeEditor.state !== Handsontable.EditorState.WAITING){
                _this.closeEditorAndSaveChanges(ctrlDown);
              }
              moveSelectionAfterEnter(event.shiftKey);

            } else {
              if (instance.getSettings().enterBeginsEditing) {
                _this.openEditor(null, event);
              } else {
                moveSelectionAfterEnter(event.shiftKey);
              }
            }
            event.preventDefault(); //don't add newline to field
            event.stopImmediatePropagation(); //required by HandsontableEditor
            break;

          case keyCodes.ESCAPE:
            if(_this.isEditorOpened()){
              _this.closeEditorAndRestoreOriginalValue(ctrlDown);
            }
            event.preventDefault();
            break;

          case keyCodes.HOME:
            if (event.ctrlKey || event.metaKey) {
              rangeModifier(new WalkontableCellCoords(0, priv.selRange.from.col));
            }
            else {
              rangeModifier(new WalkontableCellCoords(priv.selRange.from.row, 0));
            }
            event.preventDefault(); //don't scroll the window
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.END:
            if (event.ctrlKey || event.metaKey) {
              rangeModifier(new WalkontableCellCoords(instance.countRows() - 1, priv.selRange.from.col));
            }
            else {
              rangeModifier(new WalkontableCellCoords(priv.selRange.from.row, instance.countCols() - 1));
            }
            event.preventDefault(); //don't scroll the window
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.PAGE_UP:
            selection.transformStart(-instance.countVisibleRows(), 0);
            event.preventDefault(); //don't page up the window
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;

          case keyCodes.PAGE_DOWN:
            selection.transformStart(instance.countVisibleRows(), 0);
            event.preventDefault(); //don't page down the window
            Handsontable.helper.stopPropagation(event);
            //event.stopPropagation(); //required by HandsontableEditor
            break;
        }
      }

      function init() {
        instance.addHook('afterDocumentKeyDown', onKeyDown);

        eventManager.addEventListener(document.documentElement, 'keydown', function (event) {
          instance.runHooks('afterDocumentKeyDown', event);
        });

        function onDblClick(event, coords, elem) {
          // may be TD or TH
          if (elem.nodeName == "TD") {
            _this.openEditor();
          }
        }
        instance.view.wt.update('onCellDblClick', onDblClick);

        instance.addHook('afterDestroy', function(){
          destroyed = true;
        });
      }

      /**
       * Destroy current editor, if exists.
       *
       * @function destroyEditor
       * @memberof! Handsontable.EditorManager#
       * @param {Boolean} revertOriginal
       */
      this.destroyEditor = function (revertOriginal) {
        this.closeEditor(revertOriginal);
      };

      /**
       * Get active editor.
       *
       * @function getActiveEditor
       * @memberof! Handsontable.EditorManager#
       * @returns {*}
       */
      this.getActiveEditor = function () {
        return activeEditor;
      };

      /**
       * Prepare text input to be displayed at given grid cell.
       *
       * @function prepareEditor
       * @memberof! Handsontable.EditorManager#
       */
      this.prepareEditor = function () {
        var row, col, prop, td, originalValue, cellProperties, editorClass;

        if (activeEditor && activeEditor.isWaiting()) {
          this.closeEditor(false, false, function(dataSaved) {
            if (dataSaved) {
              _this.prepareEditor();
            }
          });

          return;
        }
        row = priv.selRange.highlight.row;
        col = priv.selRange.highlight.col;
        prop = instance.colToProp(col);
        td = instance.getCell(row, col);
        originalValue = instance.getDataAtCell(row, col);
        cellProperties = instance.getCellMeta(row, col);
        editorClass = instance.getCellEditor(cellProperties);

        if (editorClass) {
          activeEditor = Handsontable.editors.getEditor(editorClass, instance);
          activeEditor.prepare(row, col, prop, td, originalValue, cellProperties);

        } else {
          activeEditor = void 0;
        }
      };

      /**
       * Check is editor is opened/showed.
       *
       * @function isEditorOpened
       * @memberof! Handsontable.EditorManager#
       * @returns {Boolean}
       */
      this.isEditorOpened = function () {
        return activeEditor && activeEditor.isOpened();
      };

      /**
       * Open editor with initial value.
       *
       * @function openEditor
       * @memberof! Handsontable.EditorManager#
       * @param {String} initialValue
       * @param {DOMEvent} event
       */
      this.openEditor = function (initialValue, event) {
        if (activeEditor && !activeEditor.cellProperties.readOnly) {
          activeEditor.beginEditing(initialValue, event);
        }
      };

      /**
       * Close editor, finish editing cell.
       *
       * @function closeEditor
       * @memberof! Handsontable.EditorManager#
       * @param {Boolean} restoreOriginalValue
       * @param {Boolean} [ctrlDown]
       * @param {Function} [callback]
       */
      this.closeEditor = function (restoreOriginalValue, ctrlDown, callback) {
        if (!activeEditor) {
          if (callback) {
            callback(false);
          }
        } else {
          activeEditor.finishEditing(restoreOriginalValue, ctrlDown, callback);
        }
      };

      /**
       * Close editor and save changes.
       *
       * @function closeEditorAndSaveChanges
       * @memberof! Handsontable.EditorManager#
       * @param {Boolean} ctrlDown
       */
      this.closeEditorAndSaveChanges = function(ctrlDown){
        return this.closeEditor(false, ctrlDown);
      };

      /**
       * Close editor and restore original value.
       *
       * @function closeEditorAndRestoreOriginalValue
       * @memberof! Handsontable.EditorManager#
       * @param {Boolean} ctrlDown
       */
      this.closeEditorAndRestoreOriginalValue = function(ctrlDown){
        return this.closeEditor(true, ctrlDown);
      };

      init();
    };

  })(Handsontable);

  /**
   * Utility to register renderers and common namespace for keeping reference to all renderers classes
   */
  (function (Handsontable) {
    'use strict';

    var registeredRenderers = {};

    Handsontable.renderers = {

      /**
       * Registers renderer under given name
       * @param {String} rendererName
       * @param {Function} rendererFunction
       */
      registerRenderer: function (rendererName, rendererFunction) {
        registeredRenderers[rendererName] = rendererFunction;
      },

      /**
       * @param {String|Function} rendererName/rendererFunction
       * @returns {Function} rendererFunction
       */
      getRenderer: function (rendererName) {
        if (typeof rendererName == 'function'){
          return rendererName;
        }

        if (typeof rendererName != 'string'){
          throw Error('Only strings and functions can be passed as "renderer" parameter ');
        }

        if (!(rendererName in registeredRenderers)) {
          throw Error('No editor registered under name "' + rendererName + '"');
        }

        return registeredRenderers[rendererName];
      }

    };


  })(Handsontable);

  Handsontable.helper = {};

  /**
   * Returns true if keyCode represents a printable character
   * @param {Number} keyCode
   * @return {Boolean}
   */
  Handsontable.helper.isPrintableChar = function (keyCode) {
    return ((keyCode == 32) || //space
    (keyCode >= 48 && keyCode <= 57) || //0-9
    (keyCode >= 96 && keyCode <= 111) || //numpad
    (keyCode >= 186 && keyCode <= 192) || //;=,-./`
    (keyCode >= 219 && keyCode <= 222) || //[]{}\|"'
    keyCode >= 226 || //special chars (229 for Asian chars)
    (keyCode >= 65 && keyCode <= 90)); //a-z
  };

  Handsontable.helper.isMetaKey = function (keyCode) {
    var keyCodes = Handsontable.helper.keyCode;
    var metaKeys = [
      keyCodes.ARROW_DOWN,
      keyCodes.ARROW_UP,
      keyCodes.ARROW_LEFT,
      keyCodes.ARROW_RIGHT,
      keyCodes.HOME,
      keyCodes.END,
      keyCodes.DELETE,
      keyCodes.BACKSPACE,
      keyCodes.F1,
      keyCodes.F2,
      keyCodes.F3,
      keyCodes.F4,
      keyCodes.F5,
      keyCodes.F6,
      keyCodes.F7,
      keyCodes.F8,
      keyCodes.F9,
      keyCodes.F10,
      keyCodes.F11,
      keyCodes.F12,
      keyCodes.TAB,
      keyCodes.PAGE_DOWN,
      keyCodes.PAGE_UP,
      keyCodes.ENTER,
      keyCodes.ESCAPE,
      keyCodes.SHIFT,
      keyCodes.CAPS_LOCK,
      keyCodes.ALT
    ];

    return metaKeys.indexOf(keyCode) != -1;
  };

  Handsontable.helper.isCtrlKey = function (keyCode) {

    var keys = Handsontable.helper.keyCode;

    return [keys.CONTROL_LEFT, 224, keys.COMMAND_LEFT, keys.COMMAND_RIGHT].indexOf(keyCode) != -1;
  };

  /**
   * Converts a value to string
   * @param value
   * @return {String}
   */
  Handsontable.helper.stringify = function (value) {
    switch (typeof value) {
      case 'string':
      case 'number':
        return value + '';

      case 'object':
        if (value === null) {
          return '';
        }
        else {
          return value.toString();
        }
        break;
      case 'undefined':
        return '';

      default:
        return value.toString();
    }
  };

  /**
   * Generates spreadsheet-like column names: A, B, C, ..., Z, AA, AB, etc
   * @param index
   * @returns {String}
   */
  Handsontable.helper.spreadsheetColumnLabel = function (index) {
    var dividend = index + 1;
    var columnLabel = '';
    var modulo;
    while (dividend > 0) {
      modulo = (dividend - 1) % 26;
      columnLabel = String.fromCharCode(65 + modulo) + columnLabel;
      dividend = parseInt((dividend - modulo) / 26, 10);
    }
    return columnLabel;
  };

  /**
   * Creates 2D array of Excel-like values "A1", "A2", ...
   * @param rowCount
   * @param colCount
   * @returns {Array}
   */
  Handsontable.helper.createSpreadsheetData = function(rowCount, colCount) {
    rowCount = typeof rowCount === 'number' ? rowCount : 100;
    colCount = typeof colCount === 'number' ? colCount : 4;

    var rows = []
        , i
        , j;

    for (i = 0; i < rowCount; i++) {
      var row = [];
      for (j = 0; j < colCount; j++) {
        row.push(Handsontable.helper.spreadsheetColumnLabel(j) + (i + 1));
      }
      rows.push(row);
    }
    return rows;
  };

  Handsontable.helper.createSpreadsheetObjectData = function(rowCount, colCount) {
    rowCount = typeof rowCount === 'number' ? rowCount : 100;
    colCount = typeof colCount === 'number' ? colCount : 4;

    var rows = []
        , i
        , j;

    for (i = 0; i < rowCount; i++) {
      var row = {};
      for (j = 0; j < colCount; j++) {
        row['prop' + j] = Handsontable.helper.spreadsheetColumnLabel(j) + (i + 1);
      }
      rows.push(row);
    }
    return rows;
  };

  /**
   * Checks if value of n is a numeric one
   * http://jsperf.com/isnan-vs-isnumeric/4
   * @param n
   * @returns {boolean}
   */
  Handsontable.helper.isNumeric = function (n) {
    var t = typeof n;
    return t == 'number' ? !isNaN(n) && isFinite(n) :
        t == 'string' ? !n.length ? false :
            n.length == 1 ? /\d/.test(n) :
                /^\s*[+-]?\s*(?:(?:\d+(?:\.\d+)?(?:e[+-]?\d+)?)|(?:0x[a-f\d]+))\s*$/i.test(n) :
            t == 'object' ? !!n && typeof n.valueOf() == "number" && !(n instanceof Date) : false;
  };

  /**
   * Generates a random hex string. Used as namespace for Handsontable instance events.
   * @return {String} - 16 character random string: "92b1bfc74ec4"
   */
  Handsontable.helper.randomString = function () {
    return walkontableRandomString();
  };

  /**
   * Inherit without without calling parent constructor, and setting `Child.prototype.constructor` to `Child` instead of `Parent`.
   * Creates temporary dummy function to call it as constructor.
   * Described in ticket: https://github.com/handsontable/handsontable/pull/516
   * @param  {Object} Child  child class
   * @param  {Object} Parent parent class
   * @return {Object}        extended Child
   */
  Handsontable.helper.inherit = function (Child, Parent) {
    Parent.prototype.constructor = Parent;
    Child.prototype = new Parent();
    Child.prototype.constructor = Child;
    return Child;
  };

  /**
   * Perform shallow extend of a target object with extension's own properties
   * @param {Object} target An object that will receive the new properties
   * @param {Object} extension An object containing additional properties to merge into the target
   */
  Handsontable.helper.extend = function (target, extension) {
    for (var i in extension) {
      if (extension.hasOwnProperty(i)) {
        target[i] = extension[i];
      }
    }
  };

  /**
   * Perform deep extend of a target object with extension's own properties
   * @param {Object} target An object that will receive the new properties
   * @param {Object} extension An object containing additional properties to merge into the target
   */
  Handsontable.helper.deepExtend = function (target, extension) {
    for (var key in extension) {
      if (extension.hasOwnProperty(key)) {
        if (extension[key] && typeof extension[key] === 'object') {
          if (!target[key]) {
            if (Array.isArray(extension[key])) {
              target[key] = [];
            }
            else {
              target[key] = {};
            }
          }
          Handsontable.helper.deepExtend(target[key], extension[key]);
        }
        else {
          target[key] = extension[key];
        }
      }
    }
  };

  /**
   * Perform deep clone of an object
   * WARNING! Only clones JSON properties. Will cause error when `obj` contains a function, Date, etc
   * @param {Object} obj An object that will be cloned
   * @return {Object}
   */
  Handsontable.helper.deepClone = function (obj) {
    if (typeof obj === "object") {
      return JSON.parse(JSON.stringify(obj));
    }
    else {
      return obj;
    }
  };

  /**
   * Checks if two objects or arrays are (deep) equal
   *
   * @param {Object|Array} object1
   * @param {Object|Array} object2
   * @returns {Boolean}
   */
  Handsontable.helper.isObjectEquals = function(object1, object2) {
    return JSON.stringify(object1) === JSON.stringify(object2);
  };

  Handsontable.helper.getPrototypeOf = function (obj) {
    var prototype;

    /* jshint ignore:start */
    if(typeof obj.__proto__ == "object"){
      prototype = obj.__proto__;
    } else {
      var oldConstructor,
          constructor = obj.constructor;

      if (typeof obj.constructor == "function") {
        oldConstructor = constructor;

        if (delete obj.constructor){
          constructor = obj.constructor; // get real constructor
          obj.constructor = oldConstructor; // restore constructor
        }


      }

      prototype = constructor ? constructor.prototype : null; // needed for IE

    }
    /* jshint ignore:end */

    return prototype;
  };

  /**
   * Factory for columns constructors.
   * @param {Object} GridSettings
   * @param {Array} conflictList
   * @return {Object} ColumnSettings
   */
  Handsontable.helper.columnFactory = function (GridSettings, conflictList) {
    function ColumnSettings () {}

    Handsontable.helper.inherit(ColumnSettings, GridSettings);

    // Clear conflict settings
    for (var i = 0, len = conflictList.length; i < len; i++) {
      ColumnSettings.prototype[conflictList[i]] = void 0;
    }

    return ColumnSettings;
  };

  Handsontable.helper.translateRowsToColumns = function (input) {
    var i
        , ilen
        , j
        , jlen
        , output = []
        , olen = 0;

    for (i = 0, ilen = input.length; i < ilen; i++) {
      for (j = 0, jlen = input[i].length; j < jlen; j++) {
        if (j == olen) {
          output.push([]);
          olen++;
        }
        output[j].push(input[i][j]);
      }
    }
    return output;
  };

  Handsontable.helper.to2dArray = function (arr) {
    var i = 0
        , ilen = arr.length;
    while (i < ilen) {
      arr[i] = [arr[i]];
      i++;
    }
  };

  Handsontable.helper.extendArray = function (arr, extension) {
    var i = 0
        , ilen = extension.length;
    while (i < ilen) {
      arr.push(extension[i]);
      i++;
    }
  };

  /**
   * Determines if the given DOM element is an input field.
   * Notice: By 'input' we mean input, textarea and select nodes
   * @param element - DOM element
   * @returns {boolean}
   */
  Handsontable.helper.isInput = function (element) {
    var inputs = ['INPUT', 'SELECT', 'TEXTAREA'];

    return inputs.indexOf(element.nodeName) > -1;
  };

  /**
   * Determines if the given DOM element is an input field placed OUTSIDE of HOT.
   * Notice: By 'input' we mean input, textarea and select nodes
   * @param element - DOM element
   * @returns {boolean}
   */
  Handsontable.helper.isOutsideInput = function (element) {
    return Handsontable.helper.isInput(element) && element.className.indexOf('handsontableInput') == -1;
  };

  Handsontable.helper.keyCode = {
    MOUSE_LEFT: 1,
    MOUSE_RIGHT: 3,
    MOUSE_MIDDLE: 2,
    BACKSPACE: 8,
    COMMA: 188,
    INSERT: 45,
    DELETE: 46,
    END: 35,
    ENTER: 13,
    ESCAPE: 27,
    CONTROL_LEFT: 91,
    COMMAND_LEFT: 17,
    COMMAND_RIGHT: 93,
    ALT: 18,
    HOME: 36,
    PAGE_DOWN: 34,
    PAGE_UP: 33,
    PERIOD: 190,
    SPACE: 32,
    SHIFT: 16,
    CAPS_LOCK: 20,
    TAB: 9,
    ARROW_RIGHT: 39,
    ARROW_LEFT: 37,
    ARROW_UP: 38,
    ARROW_DOWN: 40,
    F1: 112,
    F2: 113,
    F3: 114,
    F4: 115,
    F5: 116,
    F6: 117,
    F7: 118,
    F8: 119,
    F9: 120,
    F10: 121,
    F11: 122,
    F12: 123,
    A: 65,
    X: 88,
    C: 67,
    V: 86
  };

  /**
   * Determines whether given object is a plain Object.
   * Note: String and Array are not plain Objects
   * @param {*} obj
   * @returns {boolean}
   */
  Handsontable.helper.isObject = function (obj) {
    return Object.prototype.toString.call(obj) == '[object Object]';
  };

  Handsontable.helper.pivot = function (arr) {
    var pivotedArr = [];

    if(!arr || arr.length === 0 || !arr[0] || arr[0].length === 0){
      return pivotedArr;
    }

    var rowCount = arr.length;
    var colCount = arr[0].length;

    for(var i = 0; i < rowCount; i++){
      for(var j = 0; j < colCount; j++){
        if(!pivotedArr[j]){
          pivotedArr[j] = [];
        }

        pivotedArr[j][i] = arr[i][j];
      }
    }

    return pivotedArr;

  };

  Handsontable.helper.proxy = function (fun, context) {
    return function () {
      return fun.apply(context, arguments);
    };
  };

  /**
   * Factory that produces a function for searching methods (or any properties) which could be defined directly in
   * table configuration or implicitly, within cell type definition.
   *
   * For example: renderer can be defined explicitly using "renderer" property in column configuration or it can be
   * defined implicitly using "type" property.
   *
   * Methods/properties defined explicitly always takes precedence over those defined through "type".
   *
   * If the method/property is not found in an object, searching is continued recursively through prototype chain, until
   * it reaches the Object.prototype.
   *
   *
   * @param methodName {String} name of the method/property to search (i.e. 'renderer', 'validator', 'copyable')
   * @param allowUndefined {Boolean} [optional] if false, the search is continued if methodName has not been found in cell "type"
   * @returns {Function}
   */
  Handsontable.helper.cellMethodLookupFactory = function (methodName, allowUndefined) {

    allowUndefined = typeof allowUndefined == 'undefined' ? true : allowUndefined;

    return function cellMethodLookup (row, col) {

      return (function getMethodFromProperties(properties) {

        if (!properties){

          return;                       //method not found

        }
        else if (properties.hasOwnProperty(methodName) && properties[methodName] !== void 0) { //check if it is own and is not empty

          return properties[methodName];  //method defined directly

        } else if (properties.hasOwnProperty('type') && properties.type) { //check if it is own and is not empty

          var type;

          if(typeof properties.type != 'string' ){
            throw new Error('Cell type must be a string ');
          }

          type = translateTypeNameToObject(properties.type);

          if (type.hasOwnProperty(methodName)) {
            return type[methodName]; //method defined in type.
          } else if (allowUndefined) {
            return; //method does not defined in type (eg. validator), returns undefined
          }

        }

        return getMethodFromProperties(Handsontable.helper.getPrototypeOf(properties));

      })(typeof row == 'number' ? this.getCellMeta(row, col) : row);

    };

    function translateTypeNameToObject(typeName) {
      var type = Handsontable.cellTypes[typeName];

      if(typeof type == 'undefined'){
        throw new Error('You declared cell type "' + typeName + '" as a string that is not mapped to a known object. ' +
            'Cell type must be an object or a string mapped to an object in Handsontable.cellTypes');
      }

      return type;
    }

  };

  Handsontable.helper.isMobileBrowser = function (userAgent) {
    if(!userAgent) {
      userAgent = navigator.userAgent;
    }
    return (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(userAgent));

    // Logic for checking the specific mobile browser
    //
    /* var type = type != void 0 ? type.toLowerCase() : ''
     , result;
     switch(type) {
     case '':
     result = (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent));
     return result;
     break;
     case 'ipad':
     return navigator.userAgent.indexOf('iPad') > -1;
     break;
     case 'android':
     return navigator.userAgent.indexOf('Android') > -1;
     break;
     case 'windows':
     return navigator.userAgent.indexOf('IEMobile') > -1;
     break;
     default:
     throw new Error('Invalid isMobileBrowser argument');
     break;
     } */
  };

  Handsontable.helper.isTouchSupported = function () {
    return ('ontouchstart' in window);
  };

  Handsontable.helper.stopPropagation = function (event) {
    // ie8
    //http://msdn.microsoft.com/en-us/library/ie/ff975462(v=vs.85).aspx
    if (typeof (event.stopPropagation) === 'function') {
      event.stopPropagation();
    }
    else {
      event.cancelBubble = true;
    }
  };

  Handsontable.helper.pageX = function (event) {
    if (event.pageX) {
      return event.pageX;
    }

    var scrollLeft = Handsontable.Dom.getWindowScrollLeft();
    var cursorX = event.clientX + scrollLeft;

    return cursorX;
  };

  Handsontable.helper.pageY = function (event) {
    if (event.pageY) {
      return event.pageY;
    }

    var scrollTop = Handsontable.Dom.getWindowScrollTop();
    var cursorY = event.clientY + scrollTop;

    return cursorY;
  };


  (function (Handsontable) {
    'use strict';

    /**
     * Utility class that gets and saves data from/to the data source using mapping of columns numbers to object property names
     * @todo refactor arguments of methods getRange, getText to be numbers (not objects)
     * @todo remove priv, GridSettings from object constructor
     *
     * @param {Object} instance Instance of Handsontable
     * @param {*} priv
     * @param {*} GridSettings Grid settings
     * @util
     * @class Handsontable.DataMap
     */
    Handsontable.DataMap = function (instance, priv, GridSettings) {
      this.instance = instance;
      this.priv = priv;
      this.GridSettings = GridSettings;
      this.dataSource = this.instance.getSettings().data;

      if (this.dataSource[0]) {
        this.duckSchema = this.recursiveDuckSchema(this.dataSource[0]);
      }
      else {
        this.duckSchema = {};
      }
      this.createMap();
    };

    Handsontable.DataMap.prototype.DESTINATION_RENDERER = 1;
    Handsontable.DataMap.prototype.DESTINATION_CLIPBOARD_GENERATOR = 2;

    /**
     * @param {Object|Array} obj
     * @returns {Object|Array}
     */
    Handsontable.DataMap.prototype.recursiveDuckSchema = function(obj) {
      var schema;

      if (Array.isArray(obj)) {
        schema = [];
      } else {
        schema = {};

        for (var i in obj) {
          if (obj.hasOwnProperty(i)) {
            if (obj[i] && typeof obj[i] === 'object' && !Array.isArray(obj[i])) {
              schema[i] = this.recursiveDuckSchema(obj[i]);

            } else if (Array.isArray(obj[i])) {
              if (obj[i].length && typeof obj[i][0] === 'object' && !Array.isArray(obj[i][0])) {
                schema[i] = [this.recursiveDuckSchema(obj[i][0])];
              } else {
                schema[i] = [];
              }

            } else {
              schema[i] = null;
            }
          }
        }
      }

      return schema;
    };

    /**
     * @param {Object} schema
     * @param {Number} lastCol
     * @param {Number} parent
     * @returns {Number}
     */
    Handsontable.DataMap.prototype.recursiveDuckColumns = function (schema, lastCol, parent) {
      var prop, i;
      if (typeof lastCol === 'undefined') {
        lastCol = 0;
        parent = '';
      }
      if (typeof schema === "object" && !Array.isArray(schema)) {
        for (i in schema) {
          if (schema.hasOwnProperty(i)) {
            if (schema[i] === null) {
              prop = parent + i;
              this.colToPropCache.push(prop);
              this.propToColCache.set(prop, lastCol);

              lastCol++;
            }
            else {
              lastCol = this.recursiveDuckColumns(schema[i], lastCol, i + '.');
            }
          }
        }
      }
      return lastCol;
    };

    Handsontable.DataMap.prototype.createMap = function () {
      var i, ilen, schema = this.getSchema();
      if (typeof schema === "undefined") {
        throw new Error("trying to create `columns` definition but you didnt' provide `schema` nor `data`");
      }
      this.colToPropCache = [];
      this.propToColCache = new MultiMap();
      var columns = this.instance.getSettings().columns;
      if (columns) {
        for (i = 0, ilen = columns.length; i < ilen; i++) {

          if (typeof columns[i].data != 'undefined'){
            this.colToPropCache[i] = columns[i].data;
            this.propToColCache.set(columns[i].data, i);
          }

        }
      }
      else {
        this.recursiveDuckColumns(schema);
      }
    };

    /**
     * Returns property name that corresponds with the given column index.
     *
     * @param {Number} col
     * @returns {Number}
     */
    Handsontable.DataMap.prototype.colToProp = function (col) {
      col = Handsontable.hooks.run(this.instance, 'modifyCol', col);

      if (this.colToPropCache && typeof this.colToPropCache[col] !== 'undefined') {
        return this.colToPropCache[col];
      }

      return col;
    };

    /**
     * @param {Object} prop
     * @returns {*}
     */
    Handsontable.DataMap.prototype.propToCol = function (prop) {
      var col;

      if (typeof this.propToColCache.get(prop) !== 'undefined') {
        col = this.propToColCache.get(prop);
      } else {
        col = prop;
      }
      col = Handsontable.hooks.run(this.instance, 'modifyCol', col);

      return col;
    };

    /**
     * @returns {Object}
     */
    Handsontable.DataMap.prototype.getSchema = function () {
      var schema = this.instance.getSettings().dataSchema;
      if (schema) {
        if (typeof schema === 'function') {
          return schema();
        }
        return schema;
      }
      return this.duckSchema;
    };

    /**
     * Creates row at the bottom of the data array.
     *
     * @param {Number} [index] Index of the row before which the new row will be inserted
     * @returns {Number} Returns number of created rows
     */
    Handsontable.DataMap.prototype.createRow = function (index, amount, createdAutomatically) {
      var row
          , colCount = this.instance.countCols()
          , numberOfCreatedRows = 0
          , currentIndex;

      if (!amount) {
        amount = 1;
      }

      if (typeof index !== 'number' || index >= this.instance.countRows()) {
        index = this.instance.countRows();
      }

      currentIndex = index;
      var maxRows = this.instance.getSettings().maxRows;
      while (numberOfCreatedRows < amount && this.instance.countRows() < maxRows) {

        if (this.instance.dataType === 'array') {
          row = [];
          for (var c = 0; c < colCount; c++) {
            row.push(null);
          }
        }
        else if (this.instance.dataType === 'function') {
          row = this.instance.getSettings().dataSchema(index);
        }
        else {
          row = {};
          Handsontable.helper.deepExtend(row, this.getSchema());
        }

        if (index === this.instance.countRows()) {
          this.dataSource.push(row);
        }
        else {
          this.dataSource.splice(index, 0, row);
        }

        numberOfCreatedRows++;
        currentIndex++;
      }


      Handsontable.hooks.run(this.instance, 'afterCreateRow', index, numberOfCreatedRows, createdAutomatically);
      this.instance.forceFullRender = true; //used when data was changed

      return numberOfCreatedRows;
    };

    /**
     * Creates col at the right of the data array.
     *
     * @param {Number} [index] Index of the column before which the new column will be inserted
     * @param {Number} [amount]
     * @returns {Number} Returns number of created columns
     */
    Handsontable.DataMap.prototype.createCol = function (index, amount, createdAutomatically) {
      if (this.instance.dataType === 'object' || this.instance.getSettings().columns) {
        throw new Error("Cannot create new column. When data source in an object, " +
            "you can only have as much columns as defined in first data row, data schema or in the 'columns' setting." +
            "If you want to be able to add new columns, you have to use array datasource.");
      }
      var rlen = this.instance.countRows()
          , data = this.dataSource
          , constructor
          , numberOfCreatedCols = 0
          , currentIndex;

      if (!amount) {
        amount = 1;
      }

      currentIndex = index;

      var maxCols = this.instance.getSettings().maxCols;
      while (numberOfCreatedCols < amount && this.instance.countCols() < maxCols) {
        constructor = Handsontable.helper.columnFactory(this.GridSettings, this.priv.columnsSettingConflicts);
        if (typeof index !== 'number' || index >= this.instance.countCols()) {
          for (var r = 0; r < rlen; r++) {
            if (typeof data[r] === 'undefined') {
              data[r] = [];
            }
            data[r].push(null);
          }
          // Add new column constructor
          this.priv.columnSettings.push(constructor);
        }
        else {
          for (var r = 0; r < rlen; r++) {
            data[r].splice(currentIndex, 0, null);
          }
          // Add new column constructor at given index
          this.priv.columnSettings.splice(currentIndex, 0, constructor);
        }

        numberOfCreatedCols++;
        currentIndex++;
      }

      Handsontable.hooks.run(this.instance, 'afterCreateCol', index, numberOfCreatedCols, createdAutomatically);
      this.instance.forceFullRender = true; //used when data was changed

      return numberOfCreatedCols;
    };

    /**
     * Removes row from the data array.
     *
     * @param {Number} [index] Index of the row to be removed. If not provided, the last row will be removed
     * @param {Number} [amount] Amount of the rows to be removed. If not provided, one row will be removed
     */
    Handsontable.DataMap.prototype.removeRow = function (index, amount) {
      if (!amount) {
        amount = 1;
      }
      if (typeof index !== 'number') {
        index = -amount;
      }

      index = (this.instance.countRows() + index) % this.instance.countRows();

      // We have to map the physical row ids to logical and than perform removing with (possibly) new row id
      var logicRows = this.physicalRowsToLogical(index, amount);

      var actionWasNotCancelled = Handsontable.hooks.run(this.instance, 'beforeRemoveRow', index, amount);

      if (actionWasNotCancelled === false) {
        return;
      }

      var data = this.dataSource;
      var newData = data.filter(function (row, index) {
        return logicRows.indexOf(index) == -1;
      });

      data.length = 0;
      Array.prototype.push.apply(data, newData);

      Handsontable.hooks.run(this.instance, 'afterRemoveRow', index, amount);

      this.instance.forceFullRender = true; //used when data was changed
    };

    /**
     * Removes column from the data array.
     *
     * @param {Number} [index] Index of the column to be removed. If not provided, the last column will be removed
     * @param {Number} [amount] Amount of the columns to be removed. If not provided, one column will be removed
     */
    Handsontable.DataMap.prototype.removeCol = function (index, amount) {
      if (this.instance.dataType === 'object' || this.instance.getSettings().columns) {
        throw new Error("cannot remove column with object data source or columns option specified");
      }
      if (!amount) {
        amount = 1;
      }
      if (typeof index !== 'number') {
        index = -amount;
      }

      index = (this.instance.countCols() + index) % this.instance.countCols();

      var actionWasNotCancelled = Handsontable.hooks.run(this.instance, 'beforeRemoveCol', index, amount);

      if (actionWasNotCancelled === false) {
        return;
      }

      var data = this.dataSource;
      for (var r = 0, rlen = this.instance.countRows(); r < rlen; r++) {
        data[r].splice(index, amount);
      }
      this.priv.columnSettings.splice(index, amount);

      Handsontable.hooks.run(this.instance, 'afterRemoveCol', index, amount);
      this.instance.forceFullRender = true; //used when data was changed
    };

    /**
     * Add/Removes data from the column.
     *
     * @param {Number} col Index of column in which do you want to do splice
     * @param {Number} index Index at which to start changing the array. If negative, will begin that many elements from the end
     * @param {Number} amount An integer indicating the number of old array elements to remove. If amount is 0, no elements are removed
     * @returns {Array} Returns removed portion of columns
     */
    Handsontable.DataMap.prototype.spliceCol = function (col, index, amount/*, elements...*/) {
      var elements = 4 <= arguments.length ? [].slice.call(arguments, 3) : [];

      var colData = this.instance.getDataAtCol(col);
      var removed = colData.slice(index, index + amount);
      var after = colData.slice(index + amount);

      Handsontable.helper.extendArray(elements, after);
      var i = 0;
      while (i < amount) {
        elements.push(null); //add null in place of removed elements
        i++;
      }
      Handsontable.helper.to2dArray(elements);
      this.instance.populateFromArray(index, col, elements, null, null, 'spliceCol');

      return removed;
    };

    /**
     * Add/Removes data from the row.
     *
     * @param {Number} row Index of row in which do you want to do splice
     * @param {Number} index Index at which to start changing the array. If negative, will begin that many elements from the end
     * @param {Number} amount An integer indicating the number of old array elements to remove. If amount is 0, no elements are removed
     * @returns {Array} Returns removed portion of rows
     */
    Handsontable.DataMap.prototype.spliceRow = function (row, index, amount/*, elements...*/) {
      var elements = 4 <= arguments.length ? [].slice.call(arguments, 3) : [];

      var rowData = this.instance.getSourceDataAtRow(row);
      var removed = rowData.slice(index, index + amount);
      var after = rowData.slice(index + amount);

      Handsontable.helper.extendArray(elements, after);
      var i = 0;
      while (i < amount) {
        elements.push(null); //add null in place of removed elements
        i++;
      }
      this.instance.populateFromArray(row, index, [elements], null, null, 'spliceRow');

      return removed;
    };

    /**
     * Returns single value from the data array.
     *
     * @param {Number} row
     * @param {Number} prop
     */
    Handsontable.DataMap.prototype.get = function (row, prop) {
      row = Handsontable.hooks.run(this.instance, 'modifyRow', row);

      if (typeof prop === 'string' && prop.indexOf('.') > -1) {
        var sliced = prop.split(".");
        var out = this.dataSource[row];
        if (!out) {
          return null;
        }
        for (var i = 0, ilen = sliced.length; i < ilen; i++) {
          out = out[sliced[i]];
          if (typeof out === 'undefined') {
            return null;
          }
        }
        return out;
      }
      else if (typeof prop === 'function') {
        /**
         *  allows for interacting with complex structures, for example
         *  d3/jQuery getter/setter properties:
         *
         *    {columns: [{
       *      data: function(row, value){
       *        if(arguments.length === 1){
       *          return row.property();
       *        }
       *        row.property(value);
       *      }
       *    }]}
         */
        return prop(this.dataSource.slice(
            row,
            row + 1
        )[0]);
      }
      else {
        return this.dataSource[row] ? this.dataSource[row][prop] : null;
      }
    };

    var copyableLookup = Handsontable.helper.cellMethodLookupFactory('copyable', false);

    /**
     * Returns single value from the data array (intended for clipboard copy to an external application).
     *
     * @param {Number} row
     * @param {Number} prop
     * @returns {String}
     */
    Handsontable.DataMap.prototype.getCopyable = function (row, prop) {
      if (copyableLookup.call(this.instance, row, this.propToCol(prop))) {
        return this.get(row, prop);
      }
      return '';
    };

    /**
     * Saves single value to the data array.
     *
     * @param {Number} row
     * @param {Number} prop
     * @param {String} value
     * @param {String} [source] Source of hook runner.
     */
    Handsontable.DataMap.prototype.set = function (row, prop, value, source) {
      row = Handsontable.hooks.run(this.instance, 'modifyRow', row, source || "datamapGet");

      if (typeof prop === 'string' && prop.indexOf('.') > -1) {
        var sliced = prop.split(".");
        var out = this.dataSource[row];
        for (var i = 0, ilen = sliced.length - 1; i < ilen; i++) {

          if (typeof out[sliced[i]] === 'undefined'){
            out[sliced[i]] = {};
          }
          out = out[sliced[i]];
        }
        out[sliced[i]] = value;
      }
      else if (typeof prop === 'function') {
        /* see the `function` handler in `get` */
        prop(this.dataSource.slice(
            row,
            row + 1
        )[0], value);
      }
      else {
        this.dataSource[row][prop] = value;
      }
    };

    /**
     * This ridiculous piece of code maps rows Id that are present in table data to those displayed for user.
     * The trick is, the physical row id (stored in settings.data) is not necessary the same
     * as the logical (displayed) row id (e.g. when sorting is applied).
     *
     * @param {Number} index
     * @param {Number} amount
     * @returns {Number}
     */
    Handsontable.DataMap.prototype.physicalRowsToLogical = function (index, amount) {
      var totalRows = this.instance.countRows();
      var physicRow = (totalRows + index) % totalRows;
      var logicRows = [];
      var rowsToRemove = amount;
      var row;

      while (physicRow < totalRows && rowsToRemove) {
        row = Handsontable.hooks.run(this.instance, 'modifyRow', physicRow);
        logicRows.push(row);

        rowsToRemove--;
        physicRow++;
      }

      return logicRows;
    };

    /**
     * Clears the data array.
     */
    Handsontable.DataMap.prototype.clear = function () {
      for (var r = 0; r < this.instance.countRows(); r++) {
        for (var c = 0; c < this.instance.countCols(); c++) {
          this.set(r, this.colToProp(c), '');
        }
      }
    };

    /**
     * Returns the data array.
     *
     * @returns {Array}
     */
    Handsontable.DataMap.prototype.getAll = function () {
      return this.dataSource;
    };

    /**
     * Returns data range as array.
     *
     * @param {Object} [start] Start selection position
     * @param {Object} [end] End selection position
     * @param {Number} destination Destination of datamap.get
     * @returns {Array}
     */
    Handsontable.DataMap.prototype.getRange = function (start, end, destination) {
      var r, rlen, c, clen, output = [], row;
      var getFn = destination === this.DESTINATION_CLIPBOARD_GENERATOR ? this.getCopyable : this.get;
      rlen = Math.max(start.row, end.row);
      clen = Math.max(start.col, end.col);
      for (r = Math.min(start.row, end.row); r <= rlen; r++) {
        row = [];
        for (c = Math.min(start.col, end.col); c <= clen; c++) {
          row.push(getFn.call(this, r, this.colToProp(c)));
        }
        output.push(row);
      }
      return output;
    };

    /**
     * Return data as text (tab separated columns).
     *
     * @param {Object} [start] Start selection position
     * @param {Object} [end] End selection position
     * @returns {String}
     */
    Handsontable.DataMap.prototype.getText = function (start, end) {
      return SheetClip.stringify(this.getRange(start, end, this.DESTINATION_RENDERER));
    };

    /**
     * Return data as copyable text (tab separated columns intended for clipboard copy to an external application).
     *
     * @param {Object} [start] Start selection position
     * @param {Object} [end] End selection position
     * @returns {String}
     */
    Handsontable.DataMap.prototype.getCopyableText = function (start, end) {
      return SheetClip.stringify(this.getRange(start, end, this.DESTINATION_CLIPBOARD_GENERATOR));
    };

  })(Handsontable);

  (function (Handsontable) {
    'use strict';

    /*
     Adds appropriate CSS class to table cell, based on cellProperties
     */
    Handsontable.renderers.cellDecorator = function (instance, TD, row, col, prop, value, cellProperties) {
      if (cellProperties.className) {
        if(TD.className) {
          TD.className = TD.className + " " + cellProperties.className;
        } else {
          TD.className = cellProperties.className;
        }
      }

      if (cellProperties.readOnly) {
        Handsontable.Dom.addClass(TD, cellProperties.readOnlyCellClassName);
      }

      if (cellProperties.valid === false && cellProperties.invalidCellClassName) {
        Handsontable.Dom.addClass(TD, cellProperties.invalidCellClassName);
      }
      else {
        Handsontable.Dom.removeClass(TD, cellProperties.invalidCellClassName);
      }

      if (cellProperties.wordWrap === false && cellProperties.noWordWrapClassName) {
        Handsontable.Dom.addClass(TD, cellProperties.noWordWrapClassName);
      }

      if (!value && cellProperties.placeholder) {
        Handsontable.Dom.addClass(TD, cellProperties.placeholderCellClassName);
      }
    };

  })(Handsontable);

  /**
   * Default text renderer
   * @param {Object} instance Handsontable instance
   * @param {Element} TD Table cell where to render
   * @param {Number} row
   * @param {Number} col
   * @param {String|Number} prop Row object property name
   * @param value Value to render (remember to escape unsafe HTML before inserting to DOM!)
   * @param {Object} cellProperties Cell properties (shared by cell renderer and editor)
   */
  (function (Handsontable) {
    'use strict';

    var TextRenderer = function (instance, TD, row, col, prop, value, cellProperties) {

      Handsontable.renderers.cellDecorator.apply(this, arguments);

      if (!value && cellProperties.placeholder) {
        value = cellProperties.placeholder;
      }

      var escaped = Handsontable.helper.stringify(value);

      if(!instance.getSettings().trimWhitespace) {
        escaped = escaped.replace(/ /g, String.fromCharCode(160));
      }

      if (cellProperties.rendererTemplate) {
        Handsontable.Dom.empty(TD);
        var TEMPLATE = document.createElement('TEMPLATE');
        TEMPLATE.setAttribute('bind', '{{}}');
        TEMPLATE.innerHTML = cellProperties.rendererTemplate;
        HTMLTemplateElement.decorate(TEMPLATE);
        TEMPLATE.model = instance.getSourceDataAtRow(row);
        TD.appendChild(TEMPLATE);
      }
      else {
        Handsontable.Dom.fastInnerText(TD, escaped); //this is faster than innerHTML. See: https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips
      }

    };

    //Handsontable.TextRenderer = TextRenderer; //Left for backward compatibility
    Handsontable.renderers.TextRenderer = TextRenderer;
    Handsontable.renderers.registerRenderer('text', TextRenderer);

  })(Handsontable);

  (function (Handsontable) {

    var clonableWRAPPER = document.createElement('DIV');
    clonableWRAPPER.className = 'htAutocompleteWrapper';

    var clonableARROW = document.createElement('DIV');
    clonableARROW.className = 'htAutocompleteArrow';
    clonableARROW.appendChild(document.createTextNode(String.fromCharCode(9660))); // workaround for https://github.com/handsontable/handsontable/issues/1946
//this is faster than innerHTML. See: https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips

    var wrapTdContentWithWrapper = function(TD, WRAPPER){
      WRAPPER.innerHTML = TD.innerHTML;
      Handsontable.Dom.empty(TD);
      TD.appendChild(WRAPPER);
    };

    /**
     * Autocomplete renderer
     * @param {Object} instance Handsontable instance
     * @param {Element} TD Table cell where to render
     * @param {Number} row
     * @param {Number} col
     * @param {String|Number} prop Row object property name
     * @param value Value to render (remember to escape unsafe HTML before inserting to DOM!)
     * @param {Object} cellProperties Cell properites (shared by cell renderer and editor)
     */
    var AutocompleteRenderer = function (instance, TD, row, col, prop, value, cellProperties) {

      var WRAPPER = clonableWRAPPER.cloneNode(true); //this is faster than createElement
      var ARROW = clonableARROW.cloneNode(true); //this is faster than createElement

      Handsontable.renderers.TextRenderer(instance, TD, row, col, prop, value, cellProperties);

      TD.appendChild(ARROW);
      Handsontable.Dom.addClass(TD, 'htAutocomplete');


      if (!TD.firstChild) { //http://jsperf.com/empty-node-if-needed
        //otherwise empty fields appear borderless in demo/renderers.html (IE)
        TD.appendChild(document.createTextNode(String.fromCharCode(160))); // workaround for https://github.com/handsontable/handsontable/issues/1946
        //this is faster than innerHTML. See: https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips
      }



      if (!instance.acArrowListener) {
        var eventManager = Handsontable.eventManager(instance);

        //not very elegant but easy and fast
        instance.acArrowListener = function (event) {
          if (Handsontable.Dom.hasClass(event.target,'htAutocompleteArrow')) {
            instance.view.wt.getSetting('onCellDblClick', null, new WalkontableCellCoords(row, col), TD);
          }
        };

        eventManager.addEventListener(instance.rootElement,'mousedown',instance.acArrowListener);

        //We need to unbind the listener after the table has been destroyed
        instance.addHookOnce('afterDestroy', function () {
          eventManager.clear();
        });

      }
    };

    Handsontable.AutocompleteRenderer = AutocompleteRenderer;
    Handsontable.renderers.AutocompleteRenderer = AutocompleteRenderer;
    Handsontable.renderers.registerRenderer('autocomplete', AutocompleteRenderer);
  })(Handsontable);

  /**
   * Checkbox renderer
   * @param {Object} instance Handsontable instance
   * @param {Element} TD Table cell where to render
   * @param {Number} row
   * @param {Number} col
   * @param {String|Number} prop Row object property name
   * @param value Value to render (remember to escape unsafe HTML before inserting to DOM!)
   * @param {Object} cellProperties Cell properites (shared by cell renderer and editor)
   */
  (function (Handsontable) {

    'use strict';

    var clonableINPUT = document.createElement('INPUT');
    clonableINPUT.className = 'htCheckboxRendererInput';
    clonableINPUT.type = 'checkbox';
    clonableINPUT.setAttribute('autocomplete', 'off');

    var CheckboxRenderer = function (instance, TD, row, col, prop, value, cellProperties) {

      var eventManager = Handsontable.eventManager(instance);

      if (typeof cellProperties.checkedTemplate === "undefined") {
        cellProperties.checkedTemplate = true;
      }
      if (typeof cellProperties.uncheckedTemplate === "undefined") {
        cellProperties.uncheckedTemplate = false;
      }

      Handsontable.Dom.empty(TD); //TODO identify under what circumstances this line can be removed

      var INPUT = clonableINPUT.cloneNode(false); //this is faster than createElement

      if (value === cellProperties.checkedTemplate || value === Handsontable.helper.stringify(cellProperties.checkedTemplate)) {
        INPUT.checked = true;
        TD.appendChild(INPUT);
      }
      else if (value === cellProperties.uncheckedTemplate || value === Handsontable.helper.stringify(cellProperties.uncheckedTemplate)) {
        TD.appendChild(INPUT);
      }
      else if (value === null) { //default value
        INPUT.className += ' noValue';
        TD.appendChild(INPUT);
      }
      else {
        Handsontable.Dom.fastInnerText(TD, '#bad value#'); //this is faster than innerHTML. See: https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips
      }

      if (cellProperties.readOnly) {
        eventManager.addEventListener(INPUT,'click',function (event) {
          event.preventDefault();
        });
      }
      else {
        eventManager.addEventListener(INPUT,'mousedown',function (event) {
          Handsontable.helper.stopPropagation(event);
          //event.stopPropagation(); //otherwise can confuse cell mousedown handler
        });

        eventManager.addEventListener(INPUT,'mouseup',function (event) {
          Handsontable.helper.stopPropagation(event);
          //event.stopPropagation(); //otherwise can confuse cell dblclick handler
        });

        eventManager.addEventListener(INPUT,'change',function () {
          if (this.checked) {
            instance.setDataAtRowProp(row, prop, cellProperties.checkedTemplate);
          }
          else {
            instance.setDataAtRowProp(row, prop, cellProperties.uncheckedTemplate);
          }
        });
      }

      if(!instance.CheckboxRenderer || !instance.CheckboxRenderer.beforeKeyDownHookBound){
        instance.CheckboxRenderer = {
          beforeKeyDownHookBound : true
        };

        instance.addHook('beforeKeyDown', function(event){

          Handsontable.Dom.enableImmediatePropagation(event);

          if(event.keyCode == Handsontable.helper.keyCode.SPACE || event.keyCode == Handsontable.helper.keyCode.ENTER){

            var cell, checkbox, cellProperties;

            var selRange = instance.getSelectedRange();
            var topLeft = selRange.getTopLeftCorner();
            var bottomRight = selRange.getBottomRightCorner();

            for(var row = topLeft.row; row <= bottomRight.row; row++ ){
              for(var col = topLeft.col; col <= bottomRight.col; col++){
                cell = instance.getCell(row, col);
                cellProperties = instance.getCellMeta(row, col);

                checkbox = cell.querySelectorAll('input[type=checkbox]');

                if(checkbox.length > 0 && !cellProperties.readOnly){

                  if(!event.isImmediatePropagationStopped()){
                    event.stopImmediatePropagation();
                    event.preventDefault();
                  }

                  for(var i = 0, len = checkbox.length; i < len; i++){
                    checkbox[i].checked = !checkbox[i].checked;
                    eventManager.fireEvent(checkbox[i], 'change');
                  }

                }

              }
            }
          }
        });
      }

    };

    Handsontable.CheckboxRenderer = CheckboxRenderer;
    Handsontable.renderers.CheckboxRenderer = CheckboxRenderer;
    Handsontable.renderers.registerRenderer('checkbox', CheckboxRenderer);

  })(Handsontable);

  /**
   * Numeric cell renderer
   * @param {Object} instance Handsontable instance
   * @param {Element} TD Table cell where to render
   * @param {Number} row
   * @param {Number} col
   * @param {String|Number} prop Row object property name
   * @param value Value to render (remember to escape unsafe HTML before inserting to DOM!)
   * @param {Object} cellProperties Cell properties (shared by cell renderer and editor)
   */
  (function (Handsontable) {

    'use strict';

    var NumericRenderer = function (instance, TD, row, col, prop, value, cellProperties) {
      if (Handsontable.helper.isNumeric(value)) {
        if (typeof cellProperties.language !== 'undefined') {
          numeral.language(cellProperties.language);
        }
        value = numeral(value).format(cellProperties.format || '0'); //docs: http://numeraljs.com/
        Handsontable.Dom.addClass(TD, 'htNumeric');
      }
      Handsontable.renderers.TextRenderer(instance, TD, row, col, prop, value, cellProperties);
    };

    Handsontable.NumericRenderer = NumericRenderer; //Left for backward compatibility with versions prior 0.10.0
    Handsontable.renderers.NumericRenderer = NumericRenderer;
    Handsontable.renderers.registerRenderer('numeric', NumericRenderer);

  })(Handsontable);

  (function(Handsontable){

    'use strict';

    var PasswordRenderer = function (instance, TD, row, col, prop, value, cellProperties) {
      Handsontable.renderers.TextRenderer.apply(this, arguments);

      value = TD.innerHTML;

      var hash;
      var hashLength = cellProperties.hashLength || value.length;
      var hashSymbol = cellProperties.hashSymbol || '*';

      for (hash = ''; hash.split(hashSymbol).length - 1 < hashLength; hash += hashSymbol) {}

      Handsontable.Dom.fastInnerHTML(TD, hash);

    };

    Handsontable.PasswordRenderer = PasswordRenderer;
    Handsontable.renderers.PasswordRenderer = PasswordRenderer;
    Handsontable.renderers.registerRenderer('password', PasswordRenderer);

  })(Handsontable);

  (function (Handsontable) {

    function HtmlRenderer(instance, TD, row, col, prop, value, cellProperties){

      Handsontable.renderers.cellDecorator.apply(this, arguments);

      Handsontable.Dom.fastInnerHTML(TD, value);
    }

    Handsontable.renderers.registerRenderer('html', HtmlRenderer);
    Handsontable.renderers.HtmlRenderer = HtmlRenderer;

  })(Handsontable);

  (function (Handsontable) {
    'use strict';

    Handsontable.EditorState = {
      VIRGIN: 'STATE_VIRGIN', //before editing
      EDITING: 'STATE_EDITING',
      WAITING: 'STATE_WAITING', //waiting for async validation
      FINISHED: 'STATE_FINISHED'
    };

    function BaseEditor(instance) {
      this.instance = instance;
      this.state = Handsontable.EditorState.VIRGIN;

      this._opened = false;
      this._closeCallback = null;

      this.init();
    }

    BaseEditor.prototype._fireCallbacks = function(result) {
      if(this._closeCallback){
        this._closeCallback(result);
        this._closeCallback = null;
      }
    };

    BaseEditor.prototype.init = function(){};

    BaseEditor.prototype.getValue = function(){
      throw Error('Editor getValue() method unimplemented');
    };

    BaseEditor.prototype.setValue = function(newValue){
      throw Error('Editor setValue() method unimplemented');
    };

    BaseEditor.prototype.open = function(){
      throw Error('Editor open() method unimplemented');
    };

    BaseEditor.prototype.close = function(){
      throw Error('Editor close() method unimplemented');
    };

    BaseEditor.prototype.prepare = function(row, col, prop, td, originalValue, cellProperties){
      this.TD = td;
      this.row = row;
      this.col = col;
      this.prop = prop;
      this.originalValue = originalValue;
      this.cellProperties = cellProperties;

      this.state = Handsontable.EditorState.VIRGIN;
    };

    BaseEditor.prototype.extend = function(){
      var baseClass = this.constructor;

      function Editor() {
        baseClass.apply(this, arguments);
      }
      function inherit(Child, Parent) {
        function Bridge() {}
        Bridge.prototype = Parent.prototype;
        Child.prototype = new Bridge();
        Child.prototype.constructor = Child;

        return Child;
      }

      return inherit(Editor, baseClass);
    };

    BaseEditor.prototype.saveValue = function (val, ctrlDown) {
      var sel, tmp;

      // if ctrl+enter and multiple cells selected, behave like Excel (finish editing and apply to all cells)
      if (ctrlDown) {
        sel = this.instance.getSelected();

        if (sel[0] > sel[2]) {
          tmp = sel[0];
          sel[0] = sel[2];
          sel[2] = tmp;
        }
        if (sel[1] > sel[3]) {
          tmp = sel[1];
          sel[1] = sel[3];
          sel[3] = tmp;
        }

        this.instance.populateFromArray(sel[0], sel[1], val, sel[2], sel[3], 'edit');
      }
      else {
        this.instance.populateFromArray(this.row, this.col, val, null, null, 'edit');
      }
    };

    BaseEditor.prototype.beginEditing = function(initialValue, event){
      if (this.state != Handsontable.EditorState.VIRGIN) {
        return;
      }
      this.instance.view.scrollViewport(new WalkontableCellCoords(this.row, this.col));
      this.instance.view.render();
      this.state = Handsontable.EditorState.EDITING;

      initialValue = typeof initialValue == 'string' ? initialValue : this.originalValue;
      this.setValue(Handsontable.helper.stringify(initialValue));

      this.open(event);
      this._opened = true;
      this.focus();

      // only rerender the selections (FillHandle should disappear when beginediting is triggered)
      this.instance.view.render();
    };

    BaseEditor.prototype.finishEditing = function (restoreOriginalValue, ctrlDown, callback) {
      var _this = this,
          val;

      if (callback) {
        var previousCloseCallback = this._closeCallback;

        this._closeCallback = function (result) {
          if (previousCloseCallback) {
            previousCloseCallback(result);
          }
          callback(result);
        };
      }

      if (this.isWaiting()) {
        return;
      }

      if (this.state == Handsontable.EditorState.VIRGIN) {
        this.instance._registerTimeout(setTimeout(function () {
          _this._fireCallbacks(true);
        }, 0));

        return;
      }

      if (this.state == Handsontable.EditorState.EDITING) {
        if (restoreOriginalValue) {
          this.cancelChanges();
          this.instance.view.render();

          return;
        }

        if (this.instance.getSettings().trimWhitespace) {
          // String.prototype.trim is defined in Walkontable polyfill.js
          val = [
            // We trim only string values
            [typeof this.getValue() === 'string' ? String.prototype.trim.call(this.getValue() || '') : this.getValue()]
          ];
        } else {
          val = [
            [this.getValue()]
          ];
        }

        this.state = Handsontable.EditorState.WAITING;
        this.saveValue(val, ctrlDown);

        if (this.instance.getCellValidator(this.cellProperties)) {
          this.instance.addHookOnce('postAfterValidate', function (result) {
            _this.state = Handsontable.EditorState.FINISHED;
            _this.discardEditor(result);
          });
        } else {
          this.state = Handsontable.EditorState.FINISHED;
          this.discardEditor(true);
        }
      }
    };

    BaseEditor.prototype.cancelChanges = function () {
      this.state = Handsontable.EditorState.FINISHED;
      this.discardEditor();
    };

    BaseEditor.prototype.discardEditor = function (result) {
      if (this.state !== Handsontable.EditorState.FINISHED) {
        return;
      }
      // validator was defined and failed
      if (result === false && this.cellProperties.allowInvalid !== true) {
        this.instance.selectCell(this.row, this.col);
        this.focus();
        this.state = Handsontable.EditorState.EDITING;
        this._fireCallbacks(false);

      } else {
        this.close();
        this._opened = false;
        this.state = Handsontable.EditorState.VIRGIN;
        this._fireCallbacks(true);
      }
    };

    BaseEditor.prototype.isOpened = function(){
      return this._opened;
    };

    BaseEditor.prototype.isWaiting = function () {
      return this.state === Handsontable.EditorState.WAITING;
    };

    Handsontable.editors.BaseEditor = BaseEditor;

  })(Handsontable);

  (function(Handsontable){
    var TextEditor = Handsontable.editors.BaseEditor.prototype.extend();

    TextEditor.prototype.init = function(){
      var that = this;
      this.createElements();
      this.eventManager = new Handsontable.eventManager(this);
      this.bindEvents();
      this.autoResize = autoResize();

      this.instance.addHook('afterDestroy', function () {
        that.destroy();
      });
    };

    TextEditor.prototype.getValue = function(){
      return this.TEXTAREA.value;
    };

    TextEditor.prototype.setValue = function(newValue){
      this.TEXTAREA.value = newValue;
    };

    var onBeforeKeyDown =  function onBeforeKeyDown(event){
      var instance = this,
          that = instance.getActiveEditor(),
          keyCodes, ctrlDown;

      keyCodes = Handsontable.helper.keyCode;
      ctrlDown = (event.ctrlKey || event.metaKey) && !event.altKey; //catch CTRL but not right ALT (which in some systems triggers ALT+CTRL)
      Handsontable.Dom.enableImmediatePropagation(event);

      //Process only events that have been fired in the editor
      if (event.target !== that.TEXTAREA || event.isImmediatePropagationStopped()){
        return;
      }

      if (event.keyCode === 17 || event.keyCode === 224 || event.keyCode === 91 || event.keyCode === 93) {
        //when CTRL or its equivalent is pressed and cell is edited, don't prepare selectable text in textarea
        event.stopImmediatePropagation();
        return;
      }

      switch (event.keyCode) {
        case keyCodes.ARROW_RIGHT:
          if (Handsontable.Dom.getCaretPosition(that.TEXTAREA) !== that.TEXTAREA.value.length) {
            event.stopImmediatePropagation();
          }
          break;

        case keyCodes.ARROW_LEFT: /* arrow left */
          if (Handsontable.Dom.getCaretPosition(that.TEXTAREA) !== 0) {
            event.stopImmediatePropagation();
          }
          break;

        case keyCodes.ENTER:
          var selected = that.instance.getSelected();
          var isMultipleSelection = !(selected[0] === selected[2] && selected[1] === selected[3]);
          if ((ctrlDown && !isMultipleSelection) || event.altKey) { //if ctrl+enter or alt+enter, add new line
            if(that.isOpened()){
              var caretPosition = Handsontable.Dom.getCaretPosition(that.TEXTAREA),
                  value = that.getValue();

              var newValue = value.slice(0, caretPosition) + '\n' + value.slice(caretPosition);

              that.setValue(newValue);

              Handsontable.Dom.setCaretPosition(that.TEXTAREA, caretPosition + 1);

            } else {
              that.beginEditing(that.originalValue + '\n');
            }
            event.stopImmediatePropagation();
          }
          event.preventDefault(); //don't add newline to field
          break;

        case keyCodes.A:
        case keyCodes.X:
        case keyCodes.C:
        case keyCodes.V:
          if(ctrlDown){
            event.stopImmediatePropagation(); //CTRL+A, CTRL+C, CTRL+V, CTRL+X should only work locally when cell is edited (not in table context)
          }
          break;

        case keyCodes.BACKSPACE:
        case keyCodes.DELETE:
        case keyCodes.HOME:
        case keyCodes.END:
          event.stopImmediatePropagation(); //backspace, delete, home, end should only work locally when cell is edited (not in table context)
          break;
      }

      that.autoResize.resize(String.fromCharCode(event.keyCode));
    };



    TextEditor.prototype.open = function(){
      this.refreshDimensions(); //need it instantly, to prevent https://github.com/handsontable/handsontable/issues/348

      this.instance.addHook('beforeKeyDown', onBeforeKeyDown);
    };

    TextEditor.prototype.close = function(){
      this.textareaParentStyle.display = 'none';

      this.autoResize.unObserve();

      if (document.activeElement === this.TEXTAREA) {
        this.instance.listen(); //don't refocus the table if user focused some cell outside of HT on purpose
      }

      this.instance.removeHook('beforeKeyDown', onBeforeKeyDown);
    };

    TextEditor.prototype.focus = function(){
      this.TEXTAREA.focus();
      Handsontable.Dom.setCaretPosition(this.TEXTAREA, this.TEXTAREA.value.length);
    };

    TextEditor.prototype.createElements = function () {
//    this.$body = $(document.body);

      this.TEXTAREA = document.createElement('TEXTAREA');

      Handsontable.Dom.addClass(this.TEXTAREA, 'handsontableInput');

      this.textareaStyle = this.TEXTAREA.style;
      this.textareaStyle.width = 0;
      this.textareaStyle.height = 0;

      this.TEXTAREA_PARENT = document.createElement('DIV');
      Handsontable.Dom.addClass(this.TEXTAREA_PARENT, 'handsontableInputHolder');

      this.textareaParentStyle = this.TEXTAREA_PARENT.style;
      this.textareaParentStyle.top = 0;
      this.textareaParentStyle.left = 0;
      this.textareaParentStyle.display = 'none';

      this.TEXTAREA_PARENT.appendChild(this.TEXTAREA);

      this.instance.rootElement.appendChild(this.TEXTAREA_PARENT);

      var that = this;
      this.instance._registerTimeout(setTimeout(function () {
        that.refreshDimensions();
      }, 0));
    };

    TextEditor.prototype.checkEditorSection = function () {
      if(this.row < this.instance.getSettings().fixedRowsTop) {
        if(this.col < this.instance.getSettings().fixedColumnsLeft) {
          return 'corner';
        } else {
          return 'top';
        }
      } else {
        if(this.col < this.instance.getSettings().fixedColumnsLeft) {
          return 'left';
        }
      }
    };

    TextEditor.prototype.getEditedCell = function () {
      var editorSection = this.checkEditorSection()
          , editedCell;

      switch (editorSection) {
        case 'top':
          editedCell = this.instance.view.wt.wtOverlays.topOverlay.clone.wtTable.getCell({row: this.row, col: this.col});
          this.textareaParentStyle.zIndex = 101;
          break;
        case 'corner':
          editedCell = this.instance.view.wt.wtOverlays.topLeftCornerOverlay.clone.wtTable.getCell({row: this.row, col: this.col});
          this.textareaParentStyle.zIndex = 103;
          break;
        case 'left':
          editedCell = this.instance.view.wt.wtOverlays.leftOverlay.clone.wtTable.getCell({row: this.row, col: this.col});
          this.textareaParentStyle.zIndex = 102;
          break;
        default :
          editedCell = this.instance.getCell(this.row, this.col);
          this.textareaParentStyle.zIndex = "";
          break;
      }

      return editedCell != -1 && editedCell != -2 ? editedCell : void 0;
    };


    TextEditor.prototype.refreshDimensions = function () {
      if (this.state !== Handsontable.EditorState.EDITING) {
        return;
      }

      ///start prepare textarea position
//    this.TD = this.instance.getCell(this.row, this.col);
      this.TD = this.getEditedCell();

      if (!this.TD) {
        //TD is outside of the viewport. Otherwise throws exception when scrolling the table while a cell is edited
        return;
      }
      //var $td = $(this.TD); //because old td may have been scrolled out with scrollViewport

      var currentOffset = Handsontable.Dom.offset(this.TD),
          containerOffset = Handsontable.Dom.offset(this.instance.rootElement),
          scrollableContainer = Handsontable.Dom.getScrollableElement(this.TD),
          editTop = currentOffset.top - containerOffset.top - 1 - (scrollableContainer.scrollTop || 0),
          editLeft = currentOffset.left - containerOffset.left - 1 - (scrollableContainer.scrollLeft || 0),

          settings = this.instance.getSettings(),
          rowHeadersCount = settings.rowHeaders  ? 1 : 0,
          colHeadersCount = settings.colHeaders  ? 1 : 0,
          editorSection = this.checkEditorSection(),
          backgroundColor = this.TD.style.backgroundColor,
          cssTransformOffset;

      // TODO: Refactor this to the new instance.getCell method (from #ply-59), after 0.12.1 is released
      switch(editorSection) {
        case 'top':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.topOverlay.clone.wtTable.holder.parentNode);
          break;
        case 'left':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.leftOverlay.clone.wtTable.holder.parentNode);
          break;
        case 'corner':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.topLeftCornerOverlay.clone.wtTable.holder.parentNode);
          break;
      }

      if (editTop < 0) {
        editTop = 0;
      }
      if (editLeft < 0) {
        editLeft = 0;
      }

      if(colHeadersCount && this.instance.getSelected()[0] === 0) {
        editTop += 1;
      }

      if(cssTransformOffset && cssTransformOffset != -1) {
        this.textareaParentStyle[cssTransformOffset[0]] = cssTransformOffset[1];
      } else {
        Handsontable.Dom.resetCssTransform(this.textareaParentStyle);
      }



      this.textareaParentStyle.top = editTop + 'px';
      this.textareaParentStyle.left = editLeft + 'px';

      ///end prepare textarea position


      var cellTopOffset = this.TD.offsetTop - this.instance.view.wt.wtOverlays.topOverlay.getScrollPosition(),
          cellLeftOffset = this.TD.offsetLeft - this.instance.view.wt.wtOverlays.leftOverlay.getScrollPosition();

      var width = Handsontable.Dom.innerWidth(this.TD) - 8  //$td.width()
          , maxWidth = this.instance.view.maximumVisibleElementWidth(cellLeftOffset) - 10 //10 is TEXTAREAs padding

          , height = this.TD.scrollHeight + 1
          , maxHeight = this.instance.view.maximumVisibleElementHeight(cellTopOffset) - 2; //10 is TEXTAREAs border and padding

      if (parseInt(this.TD.style.borderTopWidth, 10) > 0) {
        height -= 1;
      }
      if (parseInt(this.TD.style.borderLeftWidth, 10) > 0) {
        if (rowHeadersCount > 0) {
          width -= 1;
        }
      }

      this.TEXTAREA.style.fontSize = Handsontable.Dom.getComputedStyle(this.TD).fontSize;
      this.TEXTAREA.style.fontFamily = Handsontable.Dom.getComputedStyle(this.TD).fontFamily;

      this.TEXTAREA.style.backgroundColor = ''; //RESET STYLE

      this.TEXTAREA.style.backgroundColor = backgroundColor ? backgroundColor : Handsontable.Dom.getComputedStyle(this.TEXTAREA).backgroundColor;

      this.autoResize.init(this.TEXTAREA, {
        minHeight: Math.min(height, maxHeight),
        maxHeight: maxHeight, //TEXTAREA should never be wider than visible part of the viewport (should not cover the scrollbar)
        minWidth: Math.min(width, maxWidth),
        maxWidth: maxWidth //TEXTAREA should never be wider than visible part of the viewport (should not cover the scrollbar)
      }, true);

      this.textareaParentStyle.display = 'block';
    };

    TextEditor.prototype.bindEvents = function () {
      var editor = this;

      this.eventManager.addEventListener(this.TEXTAREA, 'cut',function (event){
        Handsontable.helper.stopPropagation(event);
        //event.stopPropagation();
      });

      this.eventManager.addEventListener(this.TEXTAREA, 'paste', function (event){
        Handsontable.helper.stopPropagation(event);
        //event.stopPropagation();
      });

      this.instance.addHook('afterScrollVertically', function () {
        editor.refreshDimensions();
      });

      this.instance.addHook('afterColumnResize', function () {
        editor.refreshDimensions();
        editor.focus();
      });

      this.instance.addHook('afterRowResize', function () {
        editor.refreshDimensions();
        editor.focus();
      });

      this.instance.addHook('afterDestroy', function () {
        editor.eventManager.clear();
      });
    };

    TextEditor.prototype.destroy = function () {
      this.eventManager.clear();
    };


    Handsontable.editors.TextEditor = TextEditor;
    Handsontable.editors.registerEditor('text', Handsontable.editors.TextEditor);

  })(Handsontable);

  (function (Handsontable) {

    var MobileTextEditor = Handsontable.editors.BaseEditor.prototype.extend();

    var domDimensionsCache = {};

    var createControls = function () {
      this.controls = {};

      this.controls.leftButton = document.createElement('DIV');
      this.controls.leftButton.className = 'leftButton';
      this.controls.rightButton = document.createElement('DIV');
      this.controls.rightButton.className = 'rightButton';
      this.controls.upButton = document.createElement('DIV');
      this.controls.upButton.className = 'upButton';
      this.controls.downButton = document.createElement('DIV');
      this.controls.downButton.className = 'downButton';

      for (var button in this.controls) {
        if (this.controls.hasOwnProperty(button)) {
          this.positionControls.appendChild(this.controls[button]);
        }
      }
    };

    MobileTextEditor.prototype.valueChanged = function () {
      return this.initValue != this.getValue();
    };

    MobileTextEditor.prototype.init = function () {
      var that = this;
      this.eventManager = new Handsontable.eventManager(this.instance);

      this.createElements();
      this.bindEvents();

      this.instance.addHook('afterDestroy', function () {
        that.destroy();
      });

    };

    MobileTextEditor.prototype.getValue = function () {
      return this.TEXTAREA.value;
    };

    MobileTextEditor.prototype.setValue = function (newValue) {
      this.initValue = newValue;

      this.TEXTAREA.value = newValue;
    };

    MobileTextEditor.prototype.createElements = function () {
      this.editorContainer = document.createElement('DIV');
      this.editorContainer.className = "htMobileEditorContainer";

      this.cellPointer = document.createElement('DIV');
      this.cellPointer.className = "cellPointer";

      this.moveHandle = document.createElement('DIV');
      this.moveHandle.className = "moveHandle";

      this.inputPane = document.createElement('DIV');
      this.inputPane.className = "inputs";

      this.positionControls = document.createElement('DIV');
      this.positionControls.className = "positionControls";

      this.TEXTAREA = document.createElement('TEXTAREA');
      Handsontable.Dom.addClass(this.TEXTAREA, 'handsontableInput');

      this.inputPane.appendChild(this.TEXTAREA);

      this.editorContainer.appendChild(this.cellPointer);
      this.editorContainer.appendChild(this.moveHandle);
      this.editorContainer.appendChild(this.inputPane);
      this.editorContainer.appendChild(this.positionControls);

      createControls.call(this);

      document.body.appendChild(this.editorContainer);
    };

    MobileTextEditor.prototype.onBeforeKeyDown = function (event) {
      var instance = this;
      var that = instance.getActiveEditor();

      Handsontable.Dom.enableImmediatePropagation(event);

      if (event.target !== that.TEXTAREA || event.isImmediatePropagationStopped()) {
        return;
      }

      var keyCodes = Handsontable.helper.keyCode;

      switch (event.keyCode) {
        case keyCodes.ENTER:
          that.close();
          event.preventDefault(); //don't add newline to field
          break;
        case keyCodes.BACKSPACE:
          event.stopImmediatePropagation(); //backspace, delete, home, end should only work locally when cell is edited (not in table context)
          break;
      }
    };

    MobileTextEditor.prototype.open = function () {
      this.instance.addHook('beforeKeyDown', this.onBeforeKeyDown);

      Handsontable.Dom.addClass(this.editorContainer, 'active');
      //this.updateEditorDimensions();
      //this.scrollToView();
      Handsontable.Dom.removeClass(this.cellPointer, 'hidden');

      this.updateEditorPosition();
    };

    MobileTextEditor.prototype.focus = function () {
      this.TEXTAREA.focus();
      Handsontable.Dom.setCaretPosition(this.TEXTAREA, this.TEXTAREA.value.length);
    };

    MobileTextEditor.prototype.close = function () {
      this.TEXTAREA.blur();
      this.instance.removeHook('beforeKeyDown', this.onBeforeKeyDown);

      Handsontable.Dom.removeClass(this.editorContainer, 'active');
    };

    MobileTextEditor.prototype.scrollToView = function () {
      var coords = this.instance.getSelectedRange().highlight;
      this.instance.view.scrollViewport(coords);
    };

    MobileTextEditor.prototype.hideCellPointer = function () {
      if (!Handsontable.Dom.hasClass(this.cellPointer, 'hidden')) {
        Handsontable.Dom.addClass(this.cellPointer, 'hidden');
      }
    };

    MobileTextEditor.prototype.updateEditorPosition = function (x, y) {
      if (x && y) {
        x = parseInt(x, 10);
        y = parseInt(y, 10);

        this.editorContainer.style.top = y + "px";
        this.editorContainer.style.left = x + "px";

      } else {
        var selection = this.instance.getSelected()
            , selectedCell = this.instance.getCell(selection[0], selection[1]);

        //cache sizes
        if (!domDimensionsCache.cellPointer) {
          domDimensionsCache.cellPointer = {
            height: Handsontable.Dom.outerHeight(this.cellPointer),
            width: Handsontable.Dom.outerWidth(this.cellPointer)
          };
        }
        if (!domDimensionsCache.editorContainer) {
          domDimensionsCache.editorContainer = {
            width: Handsontable.Dom.outerWidth(this.editorContainer)
          };
        }

        if (selectedCell !== undefined) {
          var scrollLeft = this.instance.view.wt.wtOverlays.leftOverlay.trimmingContainer == window ?
              0 : Handsontable.Dom.getScrollLeft(this.instance.view.wt.wtOverlays.leftOverlay.holder);
          var scrollTop = this.instance.view.wt.wtOverlays.topOverlay.trimmingContainer == window ?
              0 : Handsontable.Dom.getScrollTop(this.instance.view.wt.wtOverlays.topOverlay.holder);

          var selectedCellOffset = Handsontable.Dom.offset(selectedCell)
              , selectedCellWidth = Handsontable.Dom.outerWidth(selectedCell)
              , currentScrollPosition = {
                x: scrollLeft,
                y: scrollTop
              };

          this.editorContainer.style.top = parseInt(selectedCellOffset.top + Handsontable.Dom.outerHeight(selectedCell) -
                  currentScrollPosition.y + domDimensionsCache.cellPointer.height, 10) + "px";
          this.editorContainer.style.left = parseInt((window.innerWidth / 2) -
                  (domDimensionsCache.editorContainer.width / 2), 10) + "px";

          if (selectedCellOffset.left + selectedCellWidth / 2 > parseInt(this.editorContainer.style.left, 10) + domDimensionsCache.editorContainer.width) {
            this.editorContainer.style.left = window.innerWidth - domDimensionsCache.editorContainer.width + "px";
          } else if (selectedCellOffset.left + selectedCellWidth / 2 < parseInt(this.editorContainer.style.left, 10) + 20) {
            this.editorContainer.style.left = 0 + "px";
          }

          this.cellPointer.style.left = parseInt(selectedCellOffset.left - (domDimensionsCache.cellPointer.width / 2) -
                  Handsontable.Dom.offset(this.editorContainer).left + (selectedCellWidth / 2) - currentScrollPosition.x, 10) + "px";
        }
      }
    };


    // For the optional dont-affect-editor-by-zooming feature:

    //MobileTextEditor.prototype.updateEditorDimensions = function () {
    //  if(!this.beginningWindowWidth) {
    //    this.beginningWindowWidth = window.innerWidth;
    //    this.beginningEditorWidth = Handsontable.Dom.outerWidth(this.editorContainer);
    //    this.scaleRatio = this.beginningEditorWidth / this.beginningWindowWidth;
    //
    //    this.editorContainer.style.width = this.beginningEditorWidth + "px";
    //    return;
    //  }
    //
    //  var currentScaleRatio = this.beginningEditorWidth / window.innerWidth;
    //  //if(currentScaleRatio > this.scaleRatio + 0.2 || currentScaleRatio < this.scaleRatio - 0.2) {
    //  if(currentScaleRatio != this.scaleRatio) {
    //    this.editorContainer.style["zoom"] = (1 - ((currentScaleRatio * this.scaleRatio) - this.scaleRatio)) * 100 + "%";
    //  }
    //
    //};

    MobileTextEditor.prototype.updateEditorData = function () {
      var selected = this.instance.getSelected()
          , selectedValue = this.instance.getDataAtCell(selected[0], selected[1]);

      this.row = selected[0];
      this.col = selected[1];
      this.setValue(selectedValue);
      this.updateEditorPosition();
    };

    MobileTextEditor.prototype.prepareAndSave = function () {
      var val;

      if (!this.valueChanged()) {
        return true;
      }

      if (this.instance.getSettings().trimWhitespace) {
        val = [
          [String.prototype.trim.call(this.getValue())]
        ];
      } else {
        val = [
          [this.getValue()]
        ];
      }


      this.saveValue(val);
    };

    MobileTextEditor.prototype.bindEvents = function () {
      var that = this;

      this.eventManager.addEventListener(this.controls.leftButton, "touchend", function (event) {
        that.prepareAndSave();
        that.instance.selection.transformStart(0, -1, null, true);
        that.updateEditorData();
        event.preventDefault();
      });
      this.eventManager.addEventListener(this.controls.rightButton, "touchend", function (event) {
        that.prepareAndSave();
        that.instance.selection.transformStart(0, 1, null, true);
        that.updateEditorData();
        event.preventDefault();
      });
      this.eventManager.addEventListener(this.controls.upButton, "touchend", function (event) {
        that.prepareAndSave();
        that.instance.selection.transformStart(-1, 0, null, true);
        that.updateEditorData();
        event.preventDefault();
      });
      this.eventManager.addEventListener(this.controls.downButton, "touchend", function (event) {
        that.prepareAndSave();
        that.instance.selection.transformStart(1, 0, null, true);
        that.updateEditorData();
        event.preventDefault();
      });

      this.eventManager.addEventListener(this.moveHandle, "touchstart", function (event) {
        if (event.touches.length == 1) {
          var touch = event.touches[0]
              , onTouchPosition = {
                x: that.editorContainer.offsetLeft,
                y: that.editorContainer.offsetTop
              }
              , onTouchOffset = {
                x: touch.pageX - onTouchPosition.x,
                y: touch.pageY - onTouchPosition.y
              };

          that.eventManager.addEventListener(this, "touchmove", function (event) {
            var touch = event.touches[0];
            that.updateEditorPosition(touch.pageX - onTouchOffset.x, touch.pageY - onTouchOffset.y);
            that.hideCellPointer();
            event.preventDefault();
          });

        }
      });

      this.eventManager.addEventListener(document.body, "touchend", function (event) {
        if (!Handsontable.Dom.isChildOf(event.target, that.editorContainer) && !Handsontable.Dom.isChildOf(event.target, that.instance.rootElement)) {
          that.close();
        }
      });

      this.eventManager.addEventListener(this.instance.view.wt.wtOverlays.leftOverlay.holder, "scroll", function (event) {
        if (that.instance.view.wt.wtOverlays.leftOverlay.trimmingContainer != window) {
          that.hideCellPointer();
        }
      });

      this.eventManager.addEventListener(this.instance.view.wt.wtOverlays.topOverlay.holder, "scroll", function (event) {
        if (that.instance.view.wt.wtOverlays.topOverlay.trimmingContainer != window) {
          that.hideCellPointer();
        }
      });

    };

    MobileTextEditor.prototype.destroy = function () {
      this.eventManager.clear();

      this.editorContainer.parentNode.removeChild(this.editorContainer);
    };

    Handsontable.editors.MobileTextEditor = MobileTextEditor;
    Handsontable.editors.registerEditor('mobile', Handsontable.editors.MobileTextEditor);


  })(Handsontable);

  (function(Handsontable){

    //Blank editor, because all the work is done by renderer
    var CheckboxEditor = Handsontable.editors.BaseEditor.prototype.extend();

    CheckboxEditor.prototype.beginEditing = function () {
      var checkbox = this.TD.querySelector('input[type="checkbox"]');

      if (checkbox) {
        checkbox.click();
      }

    };

    CheckboxEditor.prototype.finishEditing = function () {};

    CheckboxEditor.prototype.init = function () {};
    CheckboxEditor.prototype.open = function () {};
    CheckboxEditor.prototype.close = function () {};
    CheckboxEditor.prototype.getValue = function () {};
    CheckboxEditor.prototype.setValue = function () {};
    CheckboxEditor.prototype.focus = function () {};

    Handsontable.editors.CheckboxEditor = CheckboxEditor;
    Handsontable.editors.registerEditor('checkbox', CheckboxEditor);

  })(Handsontable);


  (function (Handsontable) {
    var DateEditor = Handsontable.editors.TextEditor.prototype.extend();

    DateEditor.prototype.init = function () {
      if (typeof moment !== 'function') {
        throw new Error("You need to include moment.js to your project.");
      }

      if (typeof Pikaday !== 'function') {
        throw new Error("You need to include Pikaday to your project.");
      }

      Handsontable.editors.TextEditor.prototype.init.apply(this, arguments);

      this.isCellEdited = false;
      var that = this;

      this.instance.addHook('afterDestroy', function () {
        that.parentDestroyed = true;
        that.destroyElements();
      });
    };

    DateEditor.prototype.createElements = function () {
      var that = this;
      Handsontable.editors.TextEditor.prototype.createElements.apply(this, arguments);

      this.defaultDateFormat = 'DD/MM/YYYY';
      this.datePicker = document.createElement('DIV');
      this.datePickerStyle = this.datePicker.style;
      this.datePickerStyle.position = 'absolute';
      this.datePickerStyle.top = 0;
      this.datePickerStyle.left = 0;
      this.datePickerStyle.zIndex = 9999;

      Handsontable.Dom.addClass(this.datePicker, 'htDatepickerHolder');
      document.body.appendChild(this.datePicker);

      var htInput = this.TEXTAREA;

      var defaultOptions = {
        format: that.defaultDateFormat,
        field: htInput,
        trigger: htInput,
        container: that.datePicker,
        reposition: false,
        bound: false,
        onSelect: function (dateStr) {
          if (!isNaN(dateStr.getTime())) {
            dateStr = moment(dateStr).format(that.cellProperties.dateFormat || that.defaultDateFormat);
          }
          that.setValue(dateStr);
          that.hideDatepicker();
        },
        onClose: function () {
          if(!that.parentDestroyed) {
            that.finishEditing(false);
          }
        }
      };

      this.$datePicker = new Pikaday(defaultOptions);

      var eventManager = Handsontable.eventManager(this);

      /**
       * Prevent recognizing clicking on datepicker as clicking outside of table
       */
      eventManager.addEventListener(this.datePicker, 'mousedown', function (event) {
        Handsontable.helper.stopPropagation(event);
      });

      this.hideDatepicker();
    };

    DateEditor.prototype.destroyElements = function () {
      this.$datePicker.destroy();
    };

    DateEditor.prototype.prepare = function () {
      this._opened = false;
      Handsontable.editors.TextEditor.prototype.prepare.apply(this, arguments);
    };

    DateEditor.prototype.open = function (event) {
      Handsontable.editors.TextEditor.prototype.open.call(this);
      this.showDatepicker(event);
    };

    DateEditor.prototype.close = function () {
      var that = this;
      this._opened = false;
      this.instance._registerTimeout(setTimeout(function () {
        that.instance.selection.refreshBorders();
      }, 0));

      Handsontable.editors.TextEditor.prototype.close.apply(this, arguments);
    };

    DateEditor.prototype.finishEditing = function (isCancelled, ctrlDown) {
      if (isCancelled) { // pressed ESC, restore original value
        //var value = this.instance.getDataAtCell(this.row, this.col);
        var value = this.originalValue;
        if (value !== void 0) {
          this.setValue(value);
        }
      }

      this.hideDatepicker();
      Handsontable.editors.TextEditor.prototype.finishEditing.apply(this, arguments);
    };

    DateEditor.prototype.showDatepicker = function (event) {
      var offset = this.TD.getBoundingClientRect(),
          dateFormat = this.cellProperties.dateFormat || this.defaultDateFormat,
          datePickerConfig = this.$datePicker.config(),
          dateStr,
          isMouseDown = this.instance.view.isMouseDown(),
          isMeta = event ? Handsontable.helper.isMetaKey(event.keyCode) : false;

      this.datePickerStyle.top = (window.pageYOffset + offset.top + Handsontable.Dom.outerHeight(this.TD)) + 'px';
      this.datePickerStyle.left = (window.pageXOffset + offset.left) + 'px';

      this.$datePicker._onInputFocus = function () {};
      datePickerConfig.format = dateFormat;

      if (this.originalValue) {
        dateStr = this.originalValue;

        if (moment(dateStr, dateFormat, true).isValid()) {
          this.$datePicker.setMoment(moment(dateStr, dateFormat), true);
        }

        if (!isMeta) {
          if (!isMouseDown) {
            this.setValue('');
          }
        }

      } else {
        if (this.cellProperties.defaultDate) {
          dateStr = this.cellProperties.defaultDate;

          datePickerConfig.defaultDate = dateStr;

          if (moment(dateStr, dateFormat, true).isValid()) {
            this.$datePicker.setMoment(moment(dateStr, dateFormat), true);
          }

          if (!isMeta) {
            if (!isMouseDown) {
              this.setValue('');
            }
          }
          //this.setValue(dateStr);
        }
      }

      this.datePickerStyle.display = 'block';
      this.$datePicker.show();
    };

    DateEditor.prototype.hideDatepicker = function () {
      this.datePickerStyle.display = 'none';
      this.$datePicker.hide();
    };

    Handsontable.editors.DateEditor = DateEditor;
    Handsontable.editors.registerEditor('date', DateEditor);
  })(Handsontable);

  /**
   * This is inception. Using Handsontable as Handsontable editor
   */
  (function (Handsontable) {
    "use strict";

    var HandsontableEditor = Handsontable.editors.TextEditor.prototype.extend();

    HandsontableEditor.prototype.createElements = function () {
      Handsontable.editors.TextEditor.prototype.createElements.apply(this, arguments);

      var DIV = document.createElement('DIV');
      DIV.className = 'handsontableEditor';
      this.TEXTAREA_PARENT.appendChild(DIV);

      this.htContainer = DIV;
      this.htEditor = new Handsontable(DIV);

      this.assignHooks();
    };

    HandsontableEditor.prototype.prepare = function (td, row, col, prop, value, cellProperties) {

      Handsontable.editors.TextEditor.prototype.prepare.apply(this, arguments);

      var parent = this;

      var options = {
        startRows: 0,
        startCols: 0,
        minRows: 0,
        minCols: 0,
        className: 'listbox',
        copyPaste: false,
        cells: function () {
          return {
            readOnly: true
          };
        },
        fillHandle: false,
        afterOnCellMouseDown: function () {
          var value = this.getValue();
          if (value !== void 0) { //if the value is undefined then it means we don't want to set the value
            parent.setValue(value);
          }
          parent.instance.destroyEditor();
        }
      };

      if (this.cellProperties.handsontable) {
        Handsontable.helper.extend(options, cellProperties.handsontable);
      }
      if (this.htEditor) {
        this.htEditor.destroy();
      }

      this.htEditor = new Handsontable(this.htContainer, options);

      //this.$htContainer.handsontable('destroy');
      //this.$htContainer.handsontable(options);
    };

    var onBeforeKeyDown = function (event) {

      if (event != null && event.isImmediatePropagationEnabled == null) {
        event.stopImmediatePropagation = function () {
          this.isImmediatePropagationEnabled = false;
          this.cancelBubble = true;
        };
        event.isImmediatePropagationEnabled = true;
        event.isImmediatePropagationStopped = function () {
          return !this.isImmediatePropagationEnabled;
        };
      }

      if (event.isImmediatePropagationStopped()) {
        return;
      }

      var editor = this.getActiveEditor();

      var innerHOT = editor.htEditor.getInstance(); //Handsontable.tmpHandsontable(editor.htContainer, 'getInstance');

      var rowToSelect;

      if (event.keyCode == Handsontable.helper.keyCode.ARROW_DOWN) {
        if (!innerHOT.getSelected()) {
          rowToSelect = 0;
        }
        else {
          var selectedRow = innerHOT.getSelected()[0];
          var lastRow = innerHOT.countRows() - 1;
          rowToSelect = Math.min(lastRow, selectedRow + 1);
        }
      }
      else if (event.keyCode == Handsontable.helper.keyCode.ARROW_UP) {
        if (innerHOT.getSelected()) {
          var selectedRow = innerHOT.getSelected()[0];
          rowToSelect = selectedRow - 1;
        }
      }

      if (rowToSelect !== void 0) {
        if (rowToSelect < 0) {
          innerHOT.deselectCell();
        }
        else {
          innerHOT.selectCell(rowToSelect, 0);
        }

        event.preventDefault();
        event.stopImmediatePropagation();

        editor.instance.listen();
        editor.TEXTAREA.focus();
      }
    };

    HandsontableEditor.prototype.open = function () {

      this.instance.addHook('beforeKeyDown', onBeforeKeyDown);

      Handsontable.editors.TextEditor.prototype.open.apply(this, arguments);

      //this.$htContainer.handsontable('render');

      //Handsontable.tmpHandsontable(this.htContainer, 'render');
      this.htEditor.render();

      if (this.cellProperties.strict) {
        this.htEditor.selectCell(0,0);
        this.TEXTAREA.style.visibility = 'hidden';
      } else {
        this.htEditor.deselectCell();
        this.TEXTAREA.style.visibility = 'visible';
      }

      Handsontable.Dom.setCaretPosition(this.TEXTAREA, 0, this.TEXTAREA.value.length);

    };

    HandsontableEditor.prototype.close = function () {

      this.instance.removeHook('beforeKeyDown', onBeforeKeyDown);
      this.instance.listen();

      Handsontable.editors.TextEditor.prototype.close.apply(this, arguments);
    };

    HandsontableEditor.prototype.focus = function () {

      this.instance.listen();

      Handsontable.editors.TextEditor.prototype.focus.apply(this, arguments);
    };

    HandsontableEditor.prototype.beginEditing = function (initialValue) {
      var onBeginEditing = this.instance.getSettings().onBeginEditing;
      if (onBeginEditing && onBeginEditing() === false) {
        return;
      }

      Handsontable.editors.TextEditor.prototype.beginEditing.apply(this, arguments);

    };

    HandsontableEditor.prototype.finishEditing = function (isCancelled, ctrlDown) {
      if (this.htEditor.isListening()) { //if focus is still in the HOT editor

        //if (Handsontable.tmpHandsontable(this.htContainer,'isListening')) { //if focus is still in the HOT editor
        //if (this.$htContainer.handsontable('isListening')) { //if focus is still in the HOT editor
        this.instance.listen(); //return the focus to the parent HOT instance
      }

      if(this.htEditor.getSelected()){
        //if (Handsontable.tmpHandsontable(this.htContainer,'getSelected')) {
        //if (this.$htContainer.handsontable('getSelected')) {
        //  var value = this.$htContainer.handsontable('getInstance').getValue();
        var value = this.htEditor.getInstance().getValue();
        //var value = Handsontable.tmpHandsontable(this.htContainer,'getInstance').getValue();
        if (value !== void 0) { //if the value is undefined then it means we don't want to set the value
          this.setValue(value);
        }
      }

      return Handsontable.editors.TextEditor.prototype.finishEditing.apply(this, arguments);
    };

    HandsontableEditor.prototype.assignHooks = function () {
      var that = this;
      this.instance.addHook('afterDestroy', function () {
        if (that.htEditor) {
          that.htEditor.destroy();
        }
      });

    };

    Handsontable.editors.HandsontableEditor = HandsontableEditor;
    Handsontable.editors.registerEditor('handsontable', HandsontableEditor);



  })(Handsontable);






  (function (Handsontable) {
    var AutocompleteEditor = Handsontable.editors.HandsontableEditor.prototype.extend();

    AutocompleteEditor.prototype.init = function () {
      Handsontable.editors.HandsontableEditor.prototype.init.apply(this, arguments);

      this.query = null;
      this.choices = [];
    };

    AutocompleteEditor.prototype.createElements = function(){
      Handsontable.editors.HandsontableEditor.prototype.createElements.apply(this, arguments);

      var getSystemSpecificPaddingClass = function () {
        if(window.navigator.platform.indexOf('Mac') != -1) {
          return "htMacScroll";
        } else {
          return "";
        }
      };

      Handsontable.Dom.addClass(this.htContainer, 'autocompleteEditor');
      Handsontable.Dom.addClass(this.htContainer, getSystemSpecificPaddingClass());
    };

    var skipOne = false;
    var onBeforeKeyDown = function (event) {
      skipOne = false;
      var editor = this.getActiveEditor();
      var keyCodes = Handsontable.helper.keyCode;

      if (Handsontable.helper.isPrintableChar(event.keyCode) || event.keyCode === keyCodes.BACKSPACE || event.keyCode === keyCodes.DELETE  || event.keyCode === keyCodes.INSERT) {
        var timeOffset = 0;

        // on ctl+c / cmd+c don't update suggestion list
        if(event.keyCode === keyCodes.C && (event.ctrlKey || event.metaKey)) {
          return;
        }

        if(!editor.isOpened()) {
          timeOffset += 10;
        }

        editor.instance._registerTimeout(setTimeout(function () {
          editor.queryChoices(editor.TEXTAREA.value);
          skipOne = true;
        }, timeOffset));
      }
    };

    AutocompleteEditor.prototype.prepare = function () {
      this.instance.addHook('beforeKeyDown', onBeforeKeyDown);
      Handsontable.editors.HandsontableEditor.prototype.prepare.apply(this, arguments);
    };

    AutocompleteEditor.prototype.open = function () {
      Handsontable.editors.HandsontableEditor.prototype.open.apply(this, arguments);

      var choicesListHot = this.htEditor.getInstance();
      var that = this;

      this.TEXTAREA.style.visibility = 'visible';
      this.focus();

      choicesListHot.updateSettings({
        'colWidths': [Handsontable.Dom.outerWidth(this.TEXTAREA) - 2],
        afterRenderer: function (TD, row, col, prop, value) {
          var caseSensitive = this.getCellMeta(row, col).filteringCaseSensitive === true,
              indexOfMatch,
              match;

          if(value){
            indexOfMatch =  caseSensitive ? value.indexOf(this.query) : value.toLowerCase().indexOf(that.query.toLowerCase());

            if(indexOfMatch != -1){
              match = value.substr(indexOfMatch, that.query.length);
              TD.innerHTML = value.replace(match, '<strong>' + match + '</strong>');
            }
          }
        }
      });

      // Add additional space for autocomplete holder
      this.htEditor.view.wt.wtTable.holder.style['padding-right'] = Handsontable.Dom.getScrollbarWidth() + 2 + 'px';

      if(skipOne) {
        skipOne = false;
      }

      that.instance._registerTimeout(setTimeout(function () {
        that.queryChoices(that.TEXTAREA.value);
      }, 0));

    };

    AutocompleteEditor.prototype.close = function () {
      Handsontable.editors.HandsontableEditor.prototype.close.apply(this, arguments);
    };

    AutocompleteEditor.prototype.queryChoices = function(query){
      this.query = query;

      if (typeof this.cellProperties.source == 'function'){
        var that = this;

        this.cellProperties.source(query, function(choices){
          that.updateChoicesList(choices);
        });

      } else if (Array.isArray(this.cellProperties.source)) {

        var choices;

        if(!query || this.cellProperties.filter === false){
          choices = this.cellProperties.source;
        } else {

          var filteringCaseSensitive = this.cellProperties.filteringCaseSensitive === true;
          var lowerCaseQuery = query.toLowerCase();

          choices = this.cellProperties.source.filter(function(choice){

            if (filteringCaseSensitive) {
              return choice.indexOf(query) != -1;
            } else {
              return choice.toLowerCase().indexOf(lowerCaseQuery) != -1;
            }

          });
        }

        this.updateChoicesList(choices);

      } else {
        this.updateChoicesList([]);
      }

    };

    AutocompleteEditor.prototype.updateChoicesList = function (choices) {
      var pos = Handsontable.Dom.getCaretPosition(this.TEXTAREA),
          endPos = Handsontable.Dom.getSelectionEndPosition(this.TEXTAREA);

      var orderByRelevance = AutocompleteEditor.sortByRelevance(this.getValue(), choices, this.cellProperties.filteringCaseSensitive);
      var highlightIndex;

      /* jshint ignore:start */
      if (this.cellProperties.filter != false) {
        var sorted = [];
        for(var i = 0, choicesCount = orderByRelevance.length; i < choicesCount; i++) {
          sorted.push(choices[orderByRelevance[i]]);
        }
        highlightIndex = 0;
        choices = sorted;
      }
      else {
        highlightIndex = orderByRelevance[0];
      }
      /* jshint ignore:end */

      this.choices = choices;

      this.htEditor.loadData(Handsontable.helper.pivot([choices]));

      this.updateDropdownHeight();

      if (this.cellProperties.strict === true) {
        this.highlightBestMatchingChoice(highlightIndex);
      }

      this.instance.listen();
      this.TEXTAREA.focus();
      Handsontable.Dom.setCaretPosition(this.TEXTAREA, pos, (pos != endPos ? endPos : void 0));
    };

    AutocompleteEditor.prototype.updateDropdownHeight = function () {
      this.htEditor.updateSettings({height: this.getDropdownHeight()});
      this.htEditor.view.wt.wtTable.alignOverlaysWithTrimmingContainer();
    };

    AutocompleteEditor.prototype.finishEditing = function (restoreOriginalValue) {
      if (!restoreOriginalValue) {
        this.instance.removeHook('beforeKeyDown', onBeforeKeyDown);
      }
      Handsontable.editors.HandsontableEditor.prototype.finishEditing.apply(this, arguments);
    };

    AutocompleteEditor.prototype.highlightBestMatchingChoice = function (index) {
      if (typeof index === "number") {
        this.htEditor.selectCell(index, 0);
      } else {
        this.htEditor.deselectCell();
      }
    };

    /**
     * Filters and sorts by relevance
     * @param value
     * @param choices
     * @param caseSensitive
     * @returns {Array} array of indexes in original choices array
     */
    AutocompleteEditor.sortByRelevance = function(value, choices, caseSensitive) {

      var choicesRelevance = []
          , currentItem
          , valueLength = value.length
          , valueIndex
          , charsLeft
          , result = []
          , i
          , choicesCount;

      if(valueLength === 0) {
        for(i = 0, choicesCount = choices.length; i < choicesCount; i++) {
          result.push(i);
        }
        return result;
      }

      for(i = 0, choicesCount = choices.length; i < choicesCount; i++) {
        currentItem = choices[i];

        if(caseSensitive) {
          valueIndex = currentItem.indexOf(value);
        } else {
          valueIndex = currentItem.toLowerCase().indexOf(value.toLowerCase());
        }


        if(valueIndex == -1) { continue; }
        charsLeft =  currentItem.length - valueIndex - valueLength;

        choicesRelevance.push({
          baseIndex: i,
          index: valueIndex,
          charsLeft: charsLeft,
          value: currentItem
        });
      }

      choicesRelevance.sort(function(a, b) {

        if(b.index === -1) {
          return -1;
        }
        if(a.index === -1) {
          return 1;
        }

        if(a.index < b.index) {
          return -1;
        } else if(b.index < a.index) {
          return 1;
        } else if(a.index === b.index) {
          if(a.charsLeft < b.charsLeft) {
            return -1;
          } else if(a.charsLeft > b.charsLeft) {
            return 1;
          } else {
            return 0;
          }
        }
      });

      for (i = 0, choicesCount = choicesRelevance.length; i < choicesCount; i++) {
        result.push(choicesRelevance[i].baseIndex);
      }

      return result;
    };

    AutocompleteEditor.prototype.getDropdownHeight = function(){
      var firstRowHeight = this.htEditor.getInstance().getRowHeight(0) || 23;
      return this.choices.length >= 10 ? 10 * firstRowHeight : this.choices.length * firstRowHeight + 8;
    };

    Handsontable.editors.AutocompleteEditor = AutocompleteEditor;
    Handsontable.editors.registerEditor('autocomplete', AutocompleteEditor);

  })(Handsontable);

  (function(Handsontable){

    var PasswordEditor = Handsontable.editors.TextEditor.prototype.extend();

    PasswordEditor.prototype.createElements = function () {
      Handsontable.editors.TextEditor.prototype.createElements.apply(this, arguments);

      this.TEXTAREA = document.createElement('input');
      this.TEXTAREA.setAttribute('type', 'password');
      this.TEXTAREA.className = 'handsontableInput';
      this.textareaStyle = this.TEXTAREA.style;
      this.textareaStyle.width = 0;
      this.textareaStyle.height = 0;

      Handsontable.Dom.empty(this.TEXTAREA_PARENT);
      this.TEXTAREA_PARENT.appendChild(this.TEXTAREA);

    };

    Handsontable.editors.PasswordEditor = PasswordEditor;
    Handsontable.editors.registerEditor('password', PasswordEditor);

  })(Handsontable);

  (function (Handsontable) {

    var SelectEditor = Handsontable.editors.BaseEditor.prototype.extend();

    SelectEditor.prototype.init = function(){
      this.select = document.createElement('SELECT');
      Handsontable.Dom.addClass(this.select, 'htSelectEditor');
      this.select.style.display = 'none';
      this.instance.rootElement.appendChild(this.select);
    };

    SelectEditor.prototype.prepare = function(){
      Handsontable.editors.BaseEditor.prototype.prepare.apply(this, arguments);


      var selectOptions = this.cellProperties.selectOptions;
      var options;

      if (typeof selectOptions == 'function'){
        options =  this.prepareOptions(selectOptions(this.row, this.col, this.prop));
      } else {
        options =  this.prepareOptions(selectOptions);
      }

      Handsontable.Dom.empty(this.select);

      for (var option in options){
        if (options.hasOwnProperty(option)){
          var optionElement = document.createElement('OPTION');
          optionElement.value = option;
          Handsontable.Dom.fastInnerHTML(optionElement, options[option]);
          this.select.appendChild(optionElement);
        }
      }
    };

    SelectEditor.prototype.prepareOptions = function(optionsToPrepare){

      var preparedOptions = {};

      if (Array.isArray(optionsToPrepare)){
        for(var i = 0, len = optionsToPrepare.length; i < len; i++){
          preparedOptions[optionsToPrepare[i]] = optionsToPrepare[i];
        }
      }
      else if (typeof optionsToPrepare == 'object') {
        preparedOptions = optionsToPrepare;
      }

      return preparedOptions;

    };

    SelectEditor.prototype.getValue = function () {
      return this.select.value;
    };

    SelectEditor.prototype.setValue = function (value) {
      this.select.value = value;
    };

    var onBeforeKeyDown = function (event) {
      var instance = this;
      var editor = instance.getActiveEditor();

      if (event != null && event.isImmediatePropagationEnabled == null) {
        event.stopImmediatePropagation = function () {
          this.isImmediatePropagationEnabled = false;
        };
        event.isImmediatePropagationEnabled = true;
        event.isImmediatePropagationStopped = function () {
          return !this.isImmediatePropagationEnabled;
        };
      }

      switch (event.keyCode){
        case Handsontable.helper.keyCode.ARROW_UP:
          var previousOptionIndex = editor.select.selectedIndex - 1;
          if (previousOptionIndex >= 0 ) {
            editor.select[previousOptionIndex].selected = true;
          }

          event.stopImmediatePropagation();
          event.preventDefault();
          break;

        case Handsontable.helper.keyCode.ARROW_DOWN:
          var nextOptionIndex = editor.select.selectedIndex + 1;
          if (nextOptionIndex <= editor.select.length - 1 ) {
            editor.select[nextOptionIndex].selected = true;
          }

          event.stopImmediatePropagation();
          event.preventDefault();
          break;
      }
    };

    // TODO: Refactor this with the use of new getCell() after 0.12.1
    SelectEditor.prototype.checkEditorSection = function () {
      if(this.row < this.instance.getSettings().fixedRowsTop) {
        if(this.col < this.instance.getSettings().fixedColumnsLeft) {
          return 'corner';
        } else {
          return 'top';
        }
      } else {
        if(this.col < this.instance.getSettings().fixedColumnsLeft) {
          return 'left';
        }
      }
    };

    SelectEditor.prototype.open = function () {
      var width = Handsontable.Dom.outerWidth(this.TD); //important - group layout reads together for better performance
      var height = Handsontable.Dom.outerHeight(this.TD);
      var rootOffset = Handsontable.Dom.offset(this.instance.rootElement);
      var tdOffset = Handsontable.Dom.offset(this.TD);
      var editorSection = this.checkEditorSection();
      var cssTransformOffset;

      switch(editorSection) {
        case 'top':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.topOverlay.clone.wtTable.holder.parentNode);
          break;
        case 'left':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.leftOverlay.clone.wtTable.holder.parentNode);
          break;
        case 'corner':
          cssTransformOffset = Handsontable.Dom.getCssTransform(this.instance.view.wt.wtOverlays.topLeftCornerOverlay.clone.wtTable.holder.parentNode);
          break;
      }

      var selectStyle = this.select.style;

      if(cssTransformOffset && cssTransformOffset != -1) {
        selectStyle[cssTransformOffset[0]] = cssTransformOffset[1];
      } else {
        Handsontable.Dom.resetCssTransform(this.select);
      }

      selectStyle.height = height + 'px';
      selectStyle.minWidth = width + 'px';
      selectStyle.top = tdOffset.top - rootOffset.top + 'px';
      selectStyle.left = tdOffset.left - rootOffset.left + 'px';
      selectStyle.margin = '0px';
      selectStyle.display = '';

      this.instance.addHook('beforeKeyDown', onBeforeKeyDown);
    };

    SelectEditor.prototype.close = function () {
      this.select.style.display = 'none';
      this.instance.removeHook('beforeKeyDown', onBeforeKeyDown);
    };

    SelectEditor.prototype.focus = function () {
      this.select.focus();
    };

    Handsontable.editors.SelectEditor = SelectEditor;
    Handsontable.editors.registerEditor('select', SelectEditor);

  })(Handsontable);

  (function (Handsontable) {

    var DropdownEditor = Handsontable.editors.AutocompleteEditor.prototype.extend();

    DropdownEditor.prototype.prepare = function () {
      Handsontable.editors.AutocompleteEditor.prototype.prepare.apply(this, arguments);

      this.cellProperties.filter = false;
      this.cellProperties.strict = true;

    };


    Handsontable.editors.DropdownEditor = DropdownEditor;
    Handsontable.editors.registerEditor('dropdown', DropdownEditor);


  })(Handsontable);
  (function (Handsontable) {

    'use strict';

    var NumericEditor = Handsontable.editors.TextEditor.prototype.extend();

    NumericEditor.prototype.beginEditing = function (initialValue) {

      var BaseEditor = Handsontable.editors.TextEditor.prototype;

      if (typeof (initialValue) === 'undefined' && this.originalValue) {

        var value = '' + this.originalValue;

        if (typeof this.cellProperties.language !== 'undefined') {
          numeral.language(this.cellProperties.language);
        }

        var decimalDelimiter = numeral.languageData().delimiters.decimal;
        value = value.replace('.', decimalDelimiter);

        BaseEditor.beginEditing.apply(this, [value]);
      } else {
        BaseEditor.beginEditing.apply(this, arguments);
      }

    };

    Handsontable.editors.NumericEditor = NumericEditor;
    Handsontable.editors.registerEditor('numeric', NumericEditor);

  })(Handsontable);

  /**
   * Numeric cell validator
   * @param {*} value - Value of edited cell
   * @param {*} callback - Callback called with validation result
   */
  Handsontable.NumericValidator = function (value, callback) {
    if (value === null) {
      value = '';
    }
    callback(/^-?\d*(\.|\,)?\d*$/.test(value));
  };
  /**
   * Date cell validator
   * @param {*} value - Value of edited cell
   * @param {*} callback - Callback called with validation result
   */
  Handsontable.DateValidator = function (value, callback) {
    var correctedValue = null,
        valid = true,
        dateEditor = Handsontable.editors.getEditor('date', this.instance);

    if (value === null) {
      value = '';
    }

    var isValidDate = moment(new Date(value)).isValid(), // is value a valid date string
        isValidFormat = moment(value, this.dateFormat || dateEditor.defaultDateFormat, true).isValid(); // is it in the specified format

    if (!isValidDate) {
      valid = false;
    }

    if (!isValidDate && isValidFormat) {
      valid = true;
    }

    if (isValidDate && !isValidFormat) {
      if (this.correctFormat === true) { // if format correction is enabled
        correctedValue = correctFormat(value, this.dateFormat);
        this.instance.setDataAtCell(this.row, this.col, correctedValue, 'dateValidator');
        valid = true;
      } else {
        valid = false;
      }
    }

    callback(valid);
  };

  /**
   * Format the given string using moment.js' format feature
   * @param value
   * @param dateFormat
   * @returns {*}
   */
  var correctFormat = function (value, dateFormat) {
    value = moment(new Date(value)).format(dateFormat);
    return value;
  };


  /**
   * Function responsible for validation of autocomplete value
   * @param {*} value - Value of edited cell
   * @param {*} calback - Callback called with validation result
   */
  var process = function (value, callback) {

    var originalVal  = value;
    var lowercaseVal = typeof originalVal === 'string' ? originalVal.toLowerCase() : null;

    return function (source) {
      var found = false;
      for (var s = 0, slen = source.length; s < slen; s++) {
        if (originalVal === source[s]) {
          found = true; //perfect match
          break;
        }
        else if (lowercaseVal === source[s].toLowerCase()) {
          // changes[i][3] = source[s]; //good match, fix the case << TODO?
          found = true;
          break;
        }
      }

      callback(found);
    };
  };

  /**
   * Autocomplete cell validator
   * @param {*} value - Value of edited cell
   * @param {*} callback - Callback called with validation result
   */
  Handsontable.AutocompleteValidator = function (value, callback) {
    if (this.strict && this.source) {
      if ( typeof this.source === 'function' ) {
        this.source(value, process(value, callback));
      } else {
        process(value, callback)(this.source);
      }
    } else {
      callback(true);
    }
  };

  /**
   * Cell type is just a shortcut for setting bunch of cellProperties (used in getCellMeta)
   */

  Handsontable.mobileBrowser = Handsontable.helper.isMobileBrowser();  // check if viewed on a mobile device

  Handsontable.AutocompleteCell = {
    editor: Handsontable.editors.AutocompleteEditor,
    renderer: Handsontable.renderers.AutocompleteRenderer,
    validator: Handsontable.AutocompleteValidator
  };

  Handsontable.CheckboxCell = {
    editor: Handsontable.editors.CheckboxEditor,
    renderer: Handsontable.renderers.CheckboxRenderer
  };

  Handsontable.TextCell = {
    editor: Handsontable.mobileBrowser ? Handsontable.editors.MobileTextEditor : Handsontable.editors.TextEditor,
    renderer: Handsontable.renderers.TextRenderer
  };

  Handsontable.NumericCell = {
    editor: Handsontable.editors.NumericEditor,
    renderer: Handsontable.renderers.NumericRenderer,
    validator: Handsontable.NumericValidator,
    dataType: 'number'
  };

  Handsontable.DateCell = {
    editor: Handsontable.editors.DateEditor,
    validator: Handsontable.DateValidator,
    renderer: Handsontable.renderers.AutocompleteRenderer //displays small gray arrow on right side of the cell
  };

  Handsontable.HandsontableCell = {
    editor: Handsontable.editors.HandsontableEditor,
    renderer: Handsontable.renderers.AutocompleteRenderer //displays small gray arrow on right side of the cell
  };

  Handsontable.PasswordCell = {
    editor: Handsontable.editors.PasswordEditor,
    renderer: Handsontable.renderers.PasswordRenderer,
    copyable: false
  };

  Handsontable.DropdownCell = {
    editor: Handsontable.editors.DropdownEditor,
    renderer: Handsontable.renderers.AutocompleteRenderer, //displays small gray arrow on right side of the cell
    validator: Handsontable.AutocompleteValidator
  };

//here setup the friendly aliases that are used by cellProperties.type
  Handsontable.cellTypes = {
    text: Handsontable.TextCell,
    date: Handsontable.DateCell,
    numeric: Handsontable.NumericCell,
    checkbox: Handsontable.CheckboxCell,
    autocomplete: Handsontable.AutocompleteCell,
    handsontable: Handsontable.HandsontableCell,
    password: Handsontable.PasswordCell,
    dropdown: Handsontable.DropdownCell
  };

//here setup the friendly aliases that are used by cellProperties.renderer and cellProperties.editor
  Handsontable.cellLookup = {
    validator: {
      numeric: Handsontable.NumericValidator,
      autocomplete: Handsontable.AutocompleteValidator
    }
  };

  /**
   * autoResize - resizes a DOM element to the width and height of another DOM element
   *
   * Copyright 2014, Marcin Warpechowski
   * Licensed under the MIT license
   */
  var autoResize = function () {
    var defaults = {
          minHeight: 200,
          maxHeight: 300,
          minWidth: 100,
          maxWidth: 300
        },
        el,
        body = document.body,
        text = document.createTextNode(''),
        span = document.createElement('SPAN'),
        observe = function (element, event, handler) {
          if (window.attachEvent) {
            element.attachEvent('on' + event, handler);
          } else {
            element.addEventListener(event, handler, false);
          }
        },
        unObserve = function (element, event, handler) {
          if (window.removeEventListener) {
            element.removeEventListener(event, handler, false);
          } else {
            element.detachEvent('on' + event, handler);
          }
        },
        resize = function (newChar) {
          var width, scrollHeight;

          if (!newChar) {
            newChar = "";
          } else if (!/^[a-zA-Z \.,\\\/\|0-9]$/.test(newChar)) {
            newChar = ".";
          }

          if (text.textContent !== void 0) {
            text.textContent = el.value + newChar;
          }
          else {
            text.data = el.value + newChar; //IE8
          }
          span.style.fontSize = Handsontable.Dom.getComputedStyle(el).fontSize;
          span.style.fontFamily = Handsontable.Dom.getComputedStyle(el).fontFamily;
          span.style.whiteSpace = "pre";

          body.appendChild(span);
          width = span.clientWidth + 2;
          body.removeChild(span);

          el.style.height = defaults.minHeight + 'px';

          if (defaults.minWidth > width) {
            el.style.width = defaults.minWidth + 'px';

          } else if (width > defaults.maxWidth) {
            el.style.width = defaults.maxWidth + 'px';

          } else {
            el.style.width = width + 'px';
          }
          scrollHeight = el.scrollHeight ? el.scrollHeight - 1 : 0;

          if (defaults.minHeight > scrollHeight) {
            el.style.height = defaults.minHeight + 'px';

          } else if (defaults.maxHeight < scrollHeight) {
            el.style.height = defaults.maxHeight + 'px';
            el.style.overflowY = 'visible';

          } else {
            el.style.height = scrollHeight + 'px';
          }
        },
        delayedResize = function () {
          window.setTimeout(resize, 0);
        },
        extendDefaults = function (config) {

          if (config && config.minHeight) {
            if (config.minHeight == 'inherit') {
              defaults.minHeight = el.clientHeight;
            } else {
              var minHeight = parseInt(config.minHeight);
              if (!isNaN(minHeight)) {
                defaults.minHeight = minHeight;
              }
            }
          }

          if (config && config.maxHeight) {
            if (config.maxHeight == 'inherit') {
              defaults.maxHeight = el.clientHeight;
            } else {
              var maxHeight = parseInt(config.maxHeight);
              if (!isNaN(maxHeight)) {
                defaults.maxHeight = maxHeight;
              }
            }
          }

          if (config && config.minWidth) {
            if (config.minWidth == 'inherit') {
              defaults.minWidth = el.clientWidth;
            } else {
              var minWidth = parseInt(config.minWidth);
              if (!isNaN(minWidth)) {
                defaults.minWidth = minWidth;
              }
            }
          }

          if (config && config.maxWidth) {
            if (config.maxWidth == 'inherit') {
              defaults.maxWidth = el.clientWidth;
            } else {
              var maxWidth = parseInt(config.maxWidth);
              if (!isNaN(maxWidth)) {
                defaults.maxWidth = maxWidth;
              }
            }
          }

          if(!span.firstChild) {
            span.className = "autoResize";
            span.style.display = 'inline-block';
            span.appendChild(text);
          }
        },
        init = function (el_, config, doObserve) {
          el = el_;
          extendDefaults(config);

          if (el.nodeName == 'TEXTAREA') {

            el.style.resize = 'none';
            el.style.overflowY = '';
            el.style.height = defaults.minHeight + 'px';
            el.style.minWidth = defaults.minWidth + 'px';
            el.style.maxWidth = defaults.maxWidth + 'px';
            el.style.overflowY = 'hidden';
          }

          if(doObserve) {
            observe(el, 'change', resize);
            observe(el, 'cut', delayedResize);
            observe(el, 'paste', delayedResize);
            observe(el, 'drop', delayedResize);
            observe(el, 'keydown', delayedResize);
          }

          resize();
        };

    return {
      init: function (el_, config, doObserve) {
        init(el_, config, doObserve);
      },
      unObserve: function () {
        unObserve(el, 'change', resize);
        unObserve(el, 'cut', delayedResize);
        unObserve(el, 'paste', delayedResize);
        unObserve(el, 'drop', delayedResize);
        unObserve(el, 'keydown', delayedResize);
      },
      resize: resize
    };

  };

  /**
   * SheetClip - Spreadsheet Clipboard Parser
   * version 0.2
   *
   * This tiny library transforms JavaScript arrays to strings that are pasteable by LibreOffice, OpenOffice,
   * Google Docs and Microsoft Excel.
   *
   * Copyright 2012, Marcin Warpechowski
   * Licensed under the MIT license.
   * http://github.com/warpech/sheetclip/
   */
  /*jslint white: true*/
  (function (global) {
    "use strict";

    function countQuotes(str) {
      return str.split('"').length - 1;
    }

    global.SheetClip = {
      /**
       * Decode spreadsheet string into array
       *
       * @param {String} str
       * @returns {Array}
       */
      parse: function (str) {
        var r, rLen, rows, arr = [], a = 0, c, cLen, multiline, last;

        rows = str.split('\n');

        if (rows.length > 1 && rows[rows.length - 1] === '') {
          rows.pop();
        }
        for (r = 0, rLen = rows.length; r < rLen; r += 1) {
          rows[r] = rows[r].split('\t');

          for (c = 0, cLen = rows[r].length; c < cLen; c += 1) {
            if (!arr[a]) {
              arr[a] = [];
            }
            if (multiline && c === 0) {
              last = arr[a].length - 1;
              arr[a][last] = arr[a][last] + '\n' + rows[r][0];

              if (multiline && (countQuotes(rows[r][0]) & 1)) { //& 1 is a bitwise way of performing mod 2
                multiline = false;
                arr[a][last] = arr[a][last].substring(0, arr[a][last].length - 1).replace(/""/g, '"');
              }
            }
            else {
              if (c === cLen - 1 && rows[r][c].indexOf('"') === 0) {
                arr[a].push(rows[r][c].substring(1).replace(/""/g, '"'));
                multiline = true;
              }
              else {
                arr[a].push(rows[r][c].replace(/""/g, '"'));
                multiline = false;
              }
            }
          }
          if (!multiline) {
            a += 1;
          }
        }

        return arr;
      },

      /**
       * Encode array into valid spreadsheet string
       *
       * @param arr
       * @returns {String}
       */
      stringify: function (arr) {
        var r, rLen, c, cLen, str = '', val;

        for (r = 0, rLen = arr.length; r < rLen; r += 1) {
          cLen = arr[r].length;

          for (c = 0; c < cLen; c += 1) {
            if (c > 0) {
              str += '\t';
            }
            val = arr[r][c];

            if (typeof val === 'string') {
              if (val.indexOf('\n') > -1) {
                str += '"' + val.replace(/"/g, '""') + '"';
              }
              else {
                str += val;
              }
            }
            else if (val === null || val === void 0) { // void 0 resolves to undefined
              str += '';
            }
            else {
              str += val;
            }
          }
          str += '\n';
        }

        return str;
      }
    };
  }(window));

  /**
   * Creates a textarea that stays hidden on the page and gets focused when user presses CTRL while not having a form
   * input focused.
   * In future we may implement a better driver when better APIs are available.
   *
   * @constructor
   * @private
   */
  var CopyPaste = (function () {
    var instance;

    return {
      getInstance: function () {
        if (!instance) {
          instance = new CopyPasteClass();

        } else if (instance.hasBeenDestroyed()) {
          instance.init();
        }
        instance.refCounter ++;

        return instance;
      }
    };
  })();

  function CopyPasteClass() {
    this.refCounter = 0;
    this.init();
  }

  /**
   * Initialize CopyPaste class
   */
  CopyPasteClass.prototype.init = function () {
    var
        style,
        parent;

    this.copyCallbacks = [];
    this.cutCallbacks = [];
    this.pasteCallbacks = [];
    this._eventManager = Handsontable.eventManager(this);

    // this.listenerElement = document.documentElement;
    parent = document.body;

    if (document.getElementById('CopyPasteDiv')) {
      this.elDiv = document.getElementById('CopyPasteDiv');
      this.elTextarea = this.elDiv.firstChild;

    } else {
      this.elDiv = document.createElement('div');
      this.elDiv.id = 'CopyPasteDiv';
      style = this.elDiv.style;
      style.position = 'fixed';
      style.top = '-10000px';
      style.left = '-10000px';
      parent.appendChild(this.elDiv);

      this.elTextarea = document.createElement('textarea');
      this.elTextarea.className = 'copyPaste';
      this.elTextarea.onpaste = function(event) {
        if ('WebkitAppearance' in document.documentElement.style) { // chrome and safari
          this.value = event.clipboardData.getData("Text");

          return false;
        }
      };
      style = this.elTextarea.style;
      style.width = '10000px';
      style.height = '10000px';
      style.overflow = 'hidden';
      this.elDiv.appendChild(this.elTextarea);

      if (typeof style.opacity !== 'undefined') {
        style.opacity = 0;
      }
    }
    this.keyDownRemoveEvent = this._eventManager.addEventListener(document.documentElement, 'keydown', this.onKeyDown.bind(this), false);
  };

  /**
   * Call method on every key down event
   *
   * @param {DOMEvent} event
   */
  CopyPasteClass.prototype.onKeyDown = function(event) {
    var _this = this,
        isCtrlDown = false;

    function isActiveElementEditable() {
      var element = document.activeElement;

      if (element.shadowRoot && element.shadowRoot.activeElement) {
        element = element.shadowRoot.activeElement;
      }

      return ['INPUT', 'SELECT', 'TEXTAREA'].indexOf(element.nodeName) > -1;
    }

    // mac
    if (event.metaKey) {
      isCtrlDown = true;
    }
    // pc
    else if (event.ctrlKey && navigator.userAgent.indexOf('Mac') === -1) {
      isCtrlDown = true;
    }
    if (isCtrlDown) {
      // this is needed by fragmentSelection in Handsontable. Ignore copypaste.js behavior if fragment of cell text is selected
      if (document.activeElement !== this.elTextarea && (this.getSelectionText() !== '' || isActiveElementEditable())) {
        return;
      }
      this.selectNodeText(this.elTextarea);
      setTimeout(function () {
        _this.selectNodeText(_this.elTextarea);
      }, 0);
    }

    if (isCtrlDown &&
        (event.keyCode === Handsontable.helper.keyCode.C ||
        event.keyCode === Handsontable.helper.keyCode.V ||
        event.keyCode === Handsontable.helper.keyCode.X)) {
      // works in all browsers, incl. Opera < 12.12
      if (event.keyCode === 88) {
        setTimeout(function () {
          _this.triggerCut(event);
        }, 0);

      } else if (event.keyCode === 86) {
        setTimeout(function () {
          _this.triggerPaste(event);
        }, 0);
      }
    }
  };

//http://jsperf.com/textara-selection
//http://stackoverflow.com/questions/1502385/how-can-i-make-this-code-work-in-ie
  /**
   * Select all text contains in passed node element
   *
   * @param {Element} element
   */
  CopyPasteClass.prototype.selectNodeText = function(element) {
    if (element) {
      element.select();
    }
  };

//http://stackoverflow.com/questions/5379120/get-the-highlighted-selected-text
  /**
   * Get selection text
   *
   * @returns {String}
   */
  CopyPasteClass.prototype.getSelectionText = function() {
    var text = '';

    if (window.getSelection) {
      text = window.getSelection().toString();

    } else if (document.selection && document.selection.type !== 'Control') {
      text = document.selection.createRange().text;
    }

    return text;
  };

  /**
   * Make string copyable
   *
   * @param {String} string
   */
  CopyPasteClass.prototype.copyable = function(string) {
    if (typeof string !== 'string' && string.toString === void 0) {
      throw new Error('copyable requires string parameter');
    }
    this.elTextarea.value = string;
  };

  /*CopyPasteClass.prototype.onCopy = function (fn) {
   this.copyCallbacks.push(fn);
   };*/

  /**
   * Add function callback to onCut event
   *
   * @param {Function} callback
   */
  CopyPasteClass.prototype.onCut = function(callback) {
    this.cutCallbacks.push(callback);
  };

  /**
   * Add function callback to onPaste event
   *
   * @param {Function} callback
   */
  CopyPasteClass.prototype.onPaste = function(callback) {
    this.pasteCallbacks.push(callback);
  };

  /**
   * Remove callback from all events
   *
   * @param {Function} callback
   * @returns {Boolean}
   */
  CopyPasteClass.prototype.removeCallback = function(callback) {
    var i, len;

    for (i = 0, len = this.copyCallbacks.length; i < len; i++) {
      if (this.copyCallbacks[i] === callback) {
        this.copyCallbacks.splice(i, 1);

        return true;
      }
    }
    for (i = 0, len = this.cutCallbacks.length; i < len; i++) {
      if (this.cutCallbacks[i] === callback) {
        this.cutCallbacks.splice(i, 1);

        return true;
      }
    }
    for (i = 0, len = this.pasteCallbacks.length; i < len; i++) {
      if (this.pasteCallbacks[i] === callback) {
        this.pasteCallbacks.splice(i, 1);

        return true;
      }
    }

    return false;
  };

  /**
   * Trigger cut event
   *
   * @param {DOMEvent} event
   */
  CopyPasteClass.prototype.triggerCut = function(event) {
    var _this = this;

    if (_this.cutCallbacks) {
      setTimeout(function () {
        for (var i = 0, len = _this.cutCallbacks.length; i < len; i++) {
          _this.cutCallbacks[i](event);
        }
      }, 50);
    }
  };

  /**
   * Trigger paste event
   *
   * @param {DOMEvent} event
   * @param {String} string
   */
  CopyPasteClass.prototype.triggerPaste = function(event, string) {
    var _this = this;

    if (_this.pasteCallbacks) {
      setTimeout(function () {
        var val = string || _this.elTextarea.value;

        for (var i = 0, len = _this.pasteCallbacks.length; i < len; i++) {
          _this.pasteCallbacks[i](val, event);
        }
      }, 50);
    }
  };

  /**
   * Destroy instance
   */
  CopyPasteClass.prototype.destroy = function() {
    if (!this.hasBeenDestroyed() && --this.refCounter === 0) {
      if (this.elDiv && this.elDiv.parentNode) {
        this.elDiv.parentNode.removeChild(this.elDiv);
        this.elDiv = null;
        this.elTextarea = null;
      }
      this.keyDownRemoveEvent();
    }
  };

  /**
   * Check if instance has been destroyed
   *
   * @returns {Boolean}
   */
  CopyPasteClass.prototype.hasBeenDestroyed = function() {
    return !this.refCounter;
  };



// json-patch-duplex.js 0.3.6
// (c) 2013 Joachim Wester
// MIT license
  var jsonpatch;
  (function (jsonpatch) {
    var objOps = {
      add: function (obj, key) {
        obj[key] = this.value;
        return true;
      },
      remove: function (obj, key) {
        delete obj[key];
        return true;
      },
      replace: function (obj, key) {
        obj[key] = this.value;
        return true;
      },
      move: function (obj, key, tree) {
        var temp = { op: "_get", path: this.from };
        apply(tree, [temp]);
        apply(tree, [
          { op: "remove", path: this.from }
        ]);
        apply(tree, [
          { op: "add", path: this.path, value: temp.value }
        ]);
        return true;
      },
      copy: function (obj, key, tree) {
        var temp = { op: "_get", path: this.from };
        apply(tree, [temp]);
        apply(tree, [
          { op: "add", path: this.path, value: temp.value }
        ]);
        return true;
      },
      test: function (obj, key) {
        return (JSON.stringify(obj[key]) === JSON.stringify(this.value));
      },
      _get: function (obj, key) {
        this.value = obj[key];
      }
    };

    var arrOps = {
      add: function (arr, i) {
        arr.splice(i, 0, this.value);
        return true;
      },
      remove: function (arr, i) {
        arr.splice(i, 1);
        return true;
      },
      replace: function (arr, i) {
        arr[i] = this.value;
        return true;
      },
      move: objOps.move,
      copy: objOps.copy,
      test: objOps.test,
      _get: objOps._get
    };

    var observeOps = {
      add: function (patches, path) {
        var patch = {
          op: "add",
          path: path + escapePathComponent(this.name),
          value: this.object[this.name]
        };
        patches.push(patch);
      },
      'delete': function (patches, path) {
        var patch = {
          op: "remove",
          path: path + escapePathComponent(this.name)
        };
        patches.push(patch);
      },
      update: function (patches, path) {
        var patch = {
          op: "replace",
          path: path + escapePathComponent(this.name),
          value: this.object[this.name]
        };
        patches.push(patch);
      }
    };

    function escapePathComponent(str) {
      if (str.indexOf('/') === -1 && str.indexOf('~') === -1) {
        return str;
      }

      return str.replace(/~/g, '~0').replace(/\//g, '~1');
    }

    function _getPathRecursive(root, obj) {
      var found;
      for (var key in root) {
        if (root.hasOwnProperty(key)) {
          if (root[key] === obj) {
            return escapePathComponent(key) + '/';
          } else if (typeof root[key] === 'object') {
            found = _getPathRecursive(root[key], obj);
            /* jshint ignore:start */
            if (found != '') {
              return escapePathComponent(key) + '/' + found;
            }
            /* jshint ignore:end */
          }
        }
      }
      return '';
    }

    function getPath(root, obj) {
      if (root === obj) {
        return '/';
      }
      var path = _getPathRecursive(root, obj);
      if (path === '') {
        throw new Error("Object not found in root");
      }
      return '/' + path;
    }

    var beforeDict = [];
    /* jshint ignore:start */
    jsonpatch.intervals;
    /* jshint ignore:end */
    var Mirror = (function () {
      function Mirror(obj) {
        this.observers = [];
        this.obj = obj;
      }
      return Mirror;
    })();

    var ObserverInfo = (function () {
      function ObserverInfo(callback, observer) {
        this.callback = callback;
        this.observer = observer;
      }
      return ObserverInfo;
    })();

    function getMirror(obj) {
      for (var i = 0, ilen = beforeDict.length; i < ilen; i++) {
        if (beforeDict[i].obj === obj) {
          return beforeDict[i];
        }
      }
    }

    function getObserverFromMirror(mirror, callback) {
      for (var j = 0, jlen = mirror.observers.length; j < jlen; j++) {
        if (mirror.observers[j].callback === callback) {
          return mirror.observers[j].observer;
        }
      }
    }

    function removeObserverFromMirror(mirror, observer) {
      for (var j = 0, jlen = mirror.observers.length; j < jlen; j++) {
        if (mirror.observers[j].observer === observer) {
          mirror.observers.splice(j, 1);
          return;
        }
      }
    }

    function unobserve(root, observer) {
      generate(observer);
      if (Object.observe) {
        _unobserve(observer, root);
      } else {
        clearTimeout(observer.next);
      }

      var mirror = getMirror(root);
      removeObserverFromMirror(mirror, observer);
    }
    jsonpatch.unobserve = unobserve;

    function observe(obj, callback) {
      var patches = [];
      var root = obj;
      var observer;
      var mirror = getMirror(obj);

      if (!mirror) {
        mirror = new Mirror(obj);
        beforeDict.push(mirror);
      } else {
        observer = getObserverFromMirror(mirror, callback);
      }

      if (observer) {
        return observer;
      }

      if (Object.observe) {
        observer = function (arr) {
          //This "refresh" is needed to begin observing new object properties
          _unobserve(observer, obj);
          _observe(observer, obj);

          var a = 0, alen = arr.length;
          /* jshint ignore:start */
          while (a < alen) {
            if (!(arr[a].name === 'length' && _isArray(arr[a].object)) && !(arr[a].name === '__Jasmine_been_here_before__')) {
              var type = arr[a].type;

              switch (type) {
                case 'new':
                  type = 'add';
                  break;

                case 'deleted':
                  type = 'delete';
                  break;

                case 'updated':
                  type = 'update';
                  break;
              }

              observeOps[type].call(arr[a], patches, getPath(root, arr[a].object));
            }
            a++;
          }
          /* jshint ignore:end */

          if (patches) {
            if (callback) {
              callback(patches);
            }
          }
          observer.patches = patches;
          patches = [];
        };
      } else {
        observer = {};

        mirror.value = JSON.parse(JSON.stringify(obj));

        if (callback) {
          //callbacks.push(callback); this has no purpose
          observer.callback = callback;
          observer.next = null;
          var intervals = this.intervals || [100, 1000, 10000, 60000];
          var currentInterval = 0;

          var dirtyCheck = function () {
            generate(observer);
          };
          var fastCheck = function () {
            clearTimeout(observer.next);
            observer.next = setTimeout(function () {
              dirtyCheck();
              currentInterval = 0;
              observer.next = setTimeout(slowCheck, intervals[currentInterval++]);
            }, 0);
          };
          var slowCheck = function () {
            dirtyCheck();
            if (currentInterval == intervals.length) {
              currentInterval = intervals.length - 1;
            }
            observer.next = setTimeout(slowCheck, intervals[currentInterval++]);
          };
          if (typeof window !== 'undefined') {
            if (window.addEventListener) {
              window.addEventListener('mousedown', fastCheck);
              window.addEventListener('mouseup', fastCheck);
              window.addEventListener('keydown', fastCheck);
            } else {
              window.attachEvent('onmousedown', fastCheck);
              window.attachEvent('onmouseup', fastCheck);
              window.attachEvent('onkeydown', fastCheck);
            }
          }
          observer.next = setTimeout(slowCheck, intervals[currentInterval++]);
        }
      }
      observer.patches = patches;
      observer.object = obj;

      mirror.observers.push(new ObserverInfo(callback, observer));

      return _observe(observer, obj);
    }
    jsonpatch.observe = observe;

    /// Listen to changes on an object tree, accumulate patches
    function _observe(observer, obj) {
      if (Object.observe) {
        Object.observe(obj, observer);
        for (var key in obj) {
          if (obj.hasOwnProperty(key)) {
            var v = obj[key];
            if (v && typeof (v) === "object") {
              _observe(observer, v);
            }
          }
        }
      }
      return observer;
    }

    function _unobserve(observer, obj) {
      if (Object.observe) {
        Object.unobserve(obj, observer);
        for (var key in obj) {
          if (obj.hasOwnProperty(key)) {
            var v = obj[key];
            if (v && typeof (v) === "object") {
              _unobserve(observer, v);
            }
          }
        }
      }
      return observer;
    }

    function generate(observer) {
      if (Object.observe) {
        Object.deliverChangeRecords(observer);
      } else {
        var mirror;
        for (var i = 0, ilen = beforeDict.length; i < ilen; i++) {
          if (beforeDict[i].obj === observer.object) {
            mirror = beforeDict[i];
            break;
          }
        }
        _generate(mirror.value, observer.object, observer.patches, "");
      }
      var temp = observer.patches;
      if (temp.length > 0) {
        observer.patches = [];
        if (observer.callback) {
          observer.callback(temp);
        }
      }
      return temp;
    }
    jsonpatch.generate = generate;

    var _objectKeys;
    if (Object.keys) {
      _objectKeys = Object.keys;
    } else {
      _objectKeys = function (obj) {
        var keys = [];
        for (var o in obj) {
          if (obj.hasOwnProperty(o)) {
            keys.push(o);
          }
        }
        return keys;
      };
    }

    // Dirty check if obj is different from mirror, generate patches and update mirror
    function _generate(mirror, obj, patches, path) {
      var newKeys = _objectKeys(obj);
      var oldKeys = _objectKeys(mirror);
      var changed = false;
      var deleted = false;

      for (var t = oldKeys.length - 1; t >= 0; t--) {
        var key = oldKeys[t];
        var oldVal = mirror[key];
        if (obj.hasOwnProperty(key)) {
          var newVal = obj[key];
          if (oldVal instanceof Object) {
            _generate(oldVal, newVal, patches, path + "/" + escapePathComponent(key));
          } else {
            if (oldVal != newVal) {
              changed = true;
              patches.push({ op: "replace", path: path + "/" + escapePathComponent(key), value: newVal });
              mirror[key] = newVal;
            }
          }
        } else {
          patches.push({ op: "remove", path: path + "/" + escapePathComponent(key) });
          delete mirror[key];
          deleted = true;
        }
      }

      if (!deleted && newKeys.length == oldKeys.length) {
        return;
      }

      for (var t = 0; t < newKeys.length; t++) {
        var key = newKeys[t];
        if (!mirror.hasOwnProperty(key)) {
          patches.push({ op: "add", path: path + "/" + escapePathComponent(key), value: obj[key] });
          mirror[key] = JSON.parse(JSON.stringify(obj[key]));
        }
      }
    }

    var _isArray;
    if (Array.isArray) {
      _isArray = Array.isArray;
    } else {
      _isArray = function (obj) {
        return obj.push && typeof obj.length === 'number';
      };
    }

    /// Apply a json-patch operation on an object tree
    function apply(tree, patches) {
      var result = false, p = 0, plen = patches.length, patch;
      while (p < plen) {
        patch = patches[p];

        // Find the object
        var keys = patch.path.split('/');
        var obj = tree;
        var t = 1;
        var len = keys.length;
        while (true) {
          if (_isArray(obj)) {
            var index = parseInt(keys[t], 10);
            t++;
            if (t >= len) {
              result = arrOps[patch.op].call(patch, obj, index, tree);
              break;
            }
            obj = obj[index];
          } else {
            var key = keys[t];
            if (key.indexOf('~') != -1) {
              key = key.replace(/~1/g, '/').replace(/~0/g, '~');
            }
            t++;
            if (t >= len) {
              result = objOps[patch.op].call(patch, obj, key, tree);
              break;
            }
            obj = obj[key];
          }
        }
        p++;
      }
      return result;
    }
    jsonpatch.apply = apply;
  })(jsonpatch || (jsonpatch = {}));

  if (typeof exports !== "undefined") {
    exports.apply = jsonpatch.apply;
    exports.observe = jsonpatch.observe;
    exports.unobserve = jsonpatch.unobserve;
    exports.generate = jsonpatch.generate;
  }


  /**
   * @description
   * Handsontable events are the common interface that function in 2 ways: as __callbacks__ and as __plugin hooks__.
   *
   * @constructor Handsontable.Hooks
   * @example
   *
   * // __Using events as callbacks:__
   * ...
   * $('div#example1').handsontable({
 *   afterChange: function(changes, source) {
 *     $.ajax({
 *       url: "save.php",
 *       data: change
 *     });
 *   }
 * });
   * ...
   *
   * // __Using events as plugin hooks:__
   * ...
   * $('#example1').handsontable({
 *   'myPlugin': true
 * });
   *
   * $('#example2').handsontable({
 *   'myPlugin': false
 * });
   *
   * // global hook
   * Handsontable.PluginHooks.add('afterChange', function() {
 *   if(this.getSettings().myPlugin) {
 *     // function body - will only run in #example1
 *   }
 * });
   *
   * // local hook (has same effect as a callback)
   * $('#example2').handsontable('getInstance').addHook('afterChange', function() {
 *   // function body - will only run in #example2
 * });
   * ...
   */
  Handsontable.PluginHookClass = (function () {

    var Hooks = function () {
      return {
        /**
         * Callback fired before Walkontable instance is initiated.
         *
         * @since 0.11
         * @event Handsontable.Hooks#beforeInitWalkontable
         */
        beforeInitWalkontable: [],

        /**
         * @description
         * Callback fired before Handsontable instance is initiated.
         *
         * __Note:__ This can be set only by global PluginHooks instance.
         *
         * @event Handsontable.Hooks#beforeInit
         */
        beforeInit: [],

        /**
         * Callback fired before Handsontable table is rendered.
         *
         * @event Handsontable.Hooks#beforeRender
         * @param {Boolean} isForced If true rendering was triggered by a change of settings or data; or false if
         *                           rendering was triggered by scrolling or moving selection.
         */
        beforeRender: [],

        /**
         * Callback fired before setting range is ended.
         *
         * @event Handsontable.Hooks#beforeSetRangeEnd
         * @param {Array} coords WalkontableCellCoords array.
         */
        beforeSetRangeEnd: [],

        /**
         * @event Handsontable.Hooks#beforeDrawBorders
         */
        beforeDrawBorders: [],

        /**
         * Callback fired before one or more cells is changed. Its main purpose is to alter changes silently before input.
         *
         * @example
         * // To disregard a single change, set changes[i] to null or remove it from array using changes.splice(i, 1).
         * ...
         * $('div#example1').handsontable({
       *   beforeChange: function(changes, source) {
       *     // [[row, prop, oldVal, newVal], ...]
       *     changes[0] = null;
       *   }
       * });
         * ...
         *
         * // To alter a single change, overwrite the desired value to changes[i][3].
         * ...
         * $('div#example1').handsontable({
       *   beforeChange: function(changes, source) {
       *     // [[row, prop, oldVal, newVal], ...]
       *     changes[0][1] = 10;
       *   }
       * });
         * ...
         *
         * // To cancel all edit, return false from the callback or set array length to 0 (changes.length = 0).
         * ...
         * $('div#example1').handsontable({
       *   beforeChange: function(changes, source) {
       *     // [[row, prop, oldVal, newVal], ...]
       *     return false;
       *   }
       * });
         * ...
         *
         * @event Handsontable.Hooks#beforeChange
         * @param {Array} changes 2D array containing information about each of the edited cells.
         * @param {String} source The name of a source of changes.
         */
        beforeChange: [],

        /**
         * @event Handsontable.Hooks#beforeChangeRender
         * @since 0.11
         */
        beforeChangeRender: [],

        /**
         * Callback is fired when one or more columns are about to be removed.
         *
         * @event Handsontable.Hooks#beforeRemoveCol
         * @param {Number} index Index of starter column.
         * @param {Number} amount Amount of columns to be removed.
         */
        beforeRemoveCol: [],

        /**
         * Callback is fired when one or more rows are about to be removed.
         *
         * @event Handsontable.Hooks#beforeRemoveRow
         * @param {Number} index Index of starter column.
         * @param {Number} amount Amount of columns to be removed.
         */
        beforeRemoveRow: [],

        /**
         * @description
         * A plugin hook executed before validator function, only if validator function is defined.
         * This can be used to manipulate value of changed cell before it is applied to the validator function.
         *
         * __Notice:__ this will not affect values of changes. This will change value ONLY for validation!
         *
         * @event Handsontable.Hooks#beforeValidate
         * @since 0.9.5
         * @param {*} value
         * @param {Number} row
         * @param {String} prop
         * @param {String} source
         */
        beforeValidate: [],

        /**
         * Callback fired before getting cell settings.
         *
         * @event Handsontable.Hooks#beforeGetCellMeta
         * @param {Number} row
         * @param {Number} col
         * @param {Object} cellProperties
         */
        beforeGetCellMeta: [],

        /**
         * @event Handsontable.Hooks#beforeAutofill
         * @param {Object} start Object containing information about first filled cell: `{row: 2, col: 0}`
         * @param {Object} end Object containing information about last filled cell: `{row: 4, col: 1}`
         * @param {Array} data 2D array containing information about fill pattern: `[["1", "Ted"], ["1", "John"]]`
         */
        beforeAutofill: [],

        /**
         * Callback fired before keydown event is handled. It can be used to overwrite default key bindings.
         * Caution - in your `beforeKeyDown` handler you need to call `event.stopImmediatePropagation()` to prevent default key behavior.
         *
         * @event Handsontable.Hooks#beforeKeyDown
         * @since 0.9.0
         * @param {Object} event Original DOM event
         */
        beforeKeyDown: [],

        /**
         * @event Handsontable.Hooks#beforeOnCellMouseDown
         */
        beforeOnCellMouseDown: [],

        /**
         * @event Handsontable.Hooks#beforeTouchScroll
         */
        beforeTouchScroll: [],

        /**
         * Callback fired after Handsontable instance is initiated.
         *
         * @event Handsontable.Hooks#afterInit
         */
        afterInit : [],

        /**
         * Callback fired after new data is loaded (by `loadData` method) into the data source array.
         *
         * @event Handsontable.Hooks#afterLoadData
         */
        afterLoadData : [],

        /**
         * @event Handsontable.Hooks#afterLoadData
         */
        afterUpdateSettings: [],

        /**
         * Callback fired after Handsontable table is rendered.
         *
         * @event Handsontable.Hooks#afterRender
         * @param {Boolean} isForced Is `true` if rendering was triggered by a change of settings or data; or `false` if
         *                           rendering was triggered by scrolling or moving selection.
         */
        afterRender : [],

        /**
         * @event Handsontable.Hooks#afterRenderer
         * @since 0.11
         * @param {Object} TD
         * @param {Number} row
         * @param {Number} col
         * @param {String} prop
         * @param {String} value
         * @param {Object} cellProperties
         */
        afterRenderer : [],

        /**
         * @description
         * Callback fired after one or more cells is changed. Its main use case is to save the input.
         *
         * __Note:__ For performance reasons, the `changes` array is null for `"loadData"` source.
         *
         * @event Handsontable.Hooks#afterChange
         * @param {Array} changes 2D array containing information about each of the edited cells `[[row, prop, oldVal, newVal], ...]`
         * @param {String} source Is one of the strings: `"alter", "empty", "edit", "populateFromArray", "loadData", "autofill", "paste"`.
         */
        afterChange : [],

        /**
         * @description
         * A plugin hook executed after validator function, only if validator function is defined.
         * Validation result is the first parameter. This can be used to determinate if validation passed successfully or not.
         *
         * __You can cancel current change by returning false.__
         *
         * @event Handsontable.Hooks#afterValidate
         * @since 0.9.5
         * @param {Boolean} isValid
         * @param {*} value
         * @param {Number} row
         * @param {String} prop
         * @param {String} source
         */
        afterValidate: [],

        /**
         * Callback fired after getting cell settings.
         *
         * @event Handsontable.Hooks#afterGetCellMeta
         * @param {Number} row
         * @param {Number} col
         * @param {Object} cellProperties
         */
        afterGetCellMeta: [],

        /**
         * Called after cell meta was changed, e.g. using the context menu.
         *
         * @event Handsontable.Hooks#afterSetCellMeta
         * @since 0.11.0
         * @param {Number} row
         * @param {Number} col
         * @param {String} key
         * @param {*} value
         */
        afterSetCellMeta: [],

        /**
         * Callback fired after getting info about column header.
         *
         * @event Handsontable.Hooks#afterGetColHeader
         * @param {Number} col
         * @param {Element} TH
         */
        afterGetColHeader: [],

        /**
         * @event Handsontable.Hooks#afterGetRowHeader
         */
        afterGetRowHeader: [],

        /**
         * Callback fired after destroing Handsontable instance.
         *
         * @event Handsontable.Hooks#afterDestroy
         */
        afterDestroy: [],

        /**
         * Callback is fired when one or more rows are removed.
         *
         * @event Handsontable.Hooks#afterRemoveRow
         * @param {Number} index Is an index of starter row.
         * @param {Number} amount Is an anount of removed rows.
         */
        afterRemoveRow: [],

        /**
         * Callback is fired when a new row is created.
         *
         * @event Handsontable.Hooks#afterCreateRow
         * @param {Number} index Represents the index of first newly created row in the data source array.
         * @param {Number} amount Number of newly created rows in the data source array.
         */
        afterCreateRow: [],

        /**
         * Callback is fired when one or more columns are removed.
         *
         * @event Handsontable.Hooks#afterRemoveCol
         * @param {Number} index Is an index of starter column.
         * @param {Number} amount Is an amount of removed columns.
         */
        afterRemoveCol: [],

        /**
         * Callback is fired when a new column is created.
         *
         * @event Handsontable.Hooks#afterCreateCol
         * @param {Number} index Represents the index of first newly created column in the data source array.
         * @param {Number} amount Number of newly created columns in the data source array.
         */
        afterCreateCol: [],

        /**
         * Event called when current cell is deselected.
         *
         * @event Handsontable.Hooks#afterDeselect
         */
        afterDeselect: [],

        /**
         * Callback fired while one or more cells are being selected (on mouse move).
         *
         * @event Handsontable.Hooks#afterSelection
         * @param {Number} r Selection start row
         * @param {Number} c Selection start column
         * @param {Number} r2 Selection end row
         * @param {Number} c2 Selection end column
         */
        afterSelection: [],

        /**
         * The same as above, but data source object property name is used instead of the column number.
         *
         * @event Handsontable.Hooks#afterSelectionByProp
         * @param {Number} r Selection start row
         * @param {String} p Selection start data source object property
         * @param {Number} r2 Selection end row
         * @param {String} p2 Selection end data source object property
         */
        afterSelectionByProp: [],

        /**
         * Callback fired after one or more cells are selected (on mouse up).
         *
         * @event Handsontable.Hooks#afterSelectionEnd
         * @param {Number} r Selection start row
         * @param {Number} c Selection start column
         * @param {Number} r2 Selection end row
         * @param {Number} c2 Selection end column
         */
        afterSelectionEnd: [],

        /**
         * The same as above, but data source object property name is used instead of the column number.
         *
         * @event Handsontable.Hooks#afterSelectionEndByProp
         * @param {Number} r Selection start row
         * @param {String} p Selection start data source object property
         * @param {Number} r2 Selection end row
         * @param {String} p2 Selection end data source object property
         */
        afterSelectionEndByProp: [],

        /**
         * Callback fired after clicking on a cell or row/column header.
         * In case the row/column header was clicked, the index is negative.
         * For example clicking on the row header of cell (0, 0) results with `afterOnCellMouseDown` called with coords `{row: 0, col: -1}`.
         *
         * @event Handsontable.Hooks#afterOnCellMouseDown
         * @since 0.11
         * @param {Object} event
         * @param {Object} coords
         * @param {Object} TD
         */
        afterOnCellMouseDown: [],

        /**
         * Callback fired after hovering a cell or row/column header with the mouse cursor.
         * In case the row/column header was hovered, the index is negative.
         * For example clicking on the row header of cell (0, 0) results with `afterOnCellMouseOver` called with coords `{row: 0, col: -1}`.
         *
         * @event Handsontable.Hooks#afterOnCellMouseOver
         * @since 0.11
         * @param {Object} event
         * @param {Object} coords
         * @param {Object} TD
         */
        afterOnCellMouseOver: [],

        /**
         * @event Handsontable.Hooks#afterOnCellCornerMouseDown
         * @since 0.11
         * @param {Object} event
         */
        afterOnCellCornerMouseDown: [],

        /**
         * @event Handsontable.Hooks#afterScrollVertically
         * @since 0.11
         */
        afterScrollVertically: [],

        /**
         * @event Handsontable.Hooks#afterScrollHorizontally
         * @since 0.11
         */
        afterScrollHorizontally: [],

        /**
         * Callback fired after reset cell's meta.
         *
         * @event Handsontable.Hooks#afterCellMetaReset
         * @since 0.11
         */
        afterCellMetaReset: [],

        /**
         * @event Handsontable.Hooks#afterIsMultipleSelectionCheck
         */
        afterIsMultipleSelectionCheck: [],

        /**
         * @event Handsontable.Hooks#afterDocumentKeyDown
         */
        afterDocumentKeyDown: [],

        /**
         * @event Handsontable.Hooks#afterMomentumScroll
         */
        afterMomentumScroll: [],
        beforeCellAlignment: [],

        /**
         * Callback fired after modify column's width.
         *
         * @event Handsontable.Hooks#modifyColWidth
         * @since 0.11
         * @param {Number} width
         * @param {Number} col
         */
        modifyColWidth: [],

        /**
         * Callback fired after modify height of row.
         *
         * @event Handsontable.Hooks#modifyRowHeight
         * @since 0.11
         * @param {Number} height
         * @param {Number} row
         */
        modifyRowHeight: [],

        /**
         * Callback fired after row modify.
         *
         * @event Handsontable.Hooks#modifyRow
         * @since 0.11
         * @param {Number} row
         */
        modifyRow: [],

        /**
         * Callback fired after column modify.
         *
         * @event Handsontable.Hooks#modifyCol
         * @since 0.11
         * @param {Number} col
         */
        modifyCol: []
      };
    };

    var legacy = {
      /**
       * Now event is called {@link event:modifyCol}.
       *
       * @event Handsontable.Hooks#onBeforeChange
       * @deprecated
       * @param {Array} changes
       * @param {String} source
       */
      onBeforeChange: "beforeChange",

      /**
       * Now event is called {@link event:afterChange}.
       *
       * @event Handsontable.Hooks#onChange
       * @deprecated
       * @param {Array} changes
       * @param {String} source
       */
      onChange: "afterChange",

      /**
       * @event Handsontable.Hooks#onCreateRow
       * @deprecated
       */
      onCreateRow: "afterCreateRow",

      /**
       * @event Handsontable.Hooks#onCreateCol
       * @deprecated
       */
      onCreateCol: "afterCreateCol",

      /**
       * Now event is called {@link event:afterSelection}.
       *
       * @event Handsontable.Hooks#onSelection
       * @deprecated
       * @param {Number} r
       * @param {Number} c
       * @param {Number} r2
       * @param {Number} c2
       */
      onSelection: "afterSelection",

      /**
       * Now event is called {@link event:afterCopyLimit}.
       *
       * @event Handsontable.Hooks#onCopyLimit
       * @deprecated
       * @param {Number} selectedRowsCount
       * @param {Number} selectedColsCount
       * @param {Number} copyRowsLimit
       * @param {Number} copyColsLimit
       */
      onCopyLimit: "afterCopyLimit",

      /**
       * Now event is called {@link event:afterSelectionEnd}.
       *
       * @event Handsontable.Hooks#onSelectionEnd
       * @deprecated
       * @param {Number} r
       * @param {Number} c
       * @param {Number} r2
       * @param {Number} c2
       */
      onSelectionEnd: "afterSelectionEnd",

      /**
       * Now event is called {@link event:afterSelectionByProp}.
       *
       * @event Handsontable.Hooks#onSelectionByProp
       * @deprecated
       * @param {Number} r
       * @param {String} p
       * @param {Number} r2
       * @param {String} p2
       */
      onSelectionByProp: "afterSelectionByProp",

      /**
       * Now event is called {@link event:afterSelectionEndByProp}.
       *
       * @event Handsontable.Hooks#onSelectionEndByProp
       * @deprecated
       * @param {Number} r
       * @param {String} p
       * @param {Number} r2
       * @param {String} p2
       */
      onSelectionEndByProp: "afterSelectionEndByProp"
    };

    function PluginHookClass() {
      /* jshint ignore:start */
      this.hooks = Hooks();
      /* jshint ignore:end */
      this.globalBucket = {};
      this.legacy = legacy;

    }

    /**
     * Get hook bucket based on Handsontable instance or if instance is `undefined` get global hook bucked.
     *
     * @memberof Handsontable.Hooks#
     * @function getBucket
     * @param {Object} instance Instance of Handsontable
     * @returns {Object} Returns global or handsontable instance bucket
     */
    PluginHookClass.prototype.getBucket = function (instance) {
      if(instance) {
        if(!instance.pluginHookBucket) {
          instance.pluginHookBucket = {};
        }
        return instance.pluginHookBucket;
      }
      return this.globalBucket;
    };

    /**
     * @memberof Handsontable.Hooks#
     * @function add
     * @param {String} key Hook/Event name
     * @param {Function} fn Callback function
     * @param {Object} instance Instance of Handsontable
     * @returns {Handsontable.Hooks} Instance of Handsontable.Hooks
     */
    PluginHookClass.prototype.add = function (key, fn, instance) {
      //if fn is array, run this for all the array items
      if (Array.isArray(fn)) {
        for (var i = 0, len = fn.length; i < len; i++) {
          this.add(key, fn[i]);
        }
      }
      else {
        // provide support for old versions of HOT
        if (key in legacy) {
          key = legacy[key];
        }

        var bucket = this.getBucket(instance);

        if (typeof bucket[key] === "undefined") {
          bucket[key] = [];
        }

        fn.skip = false;

        if (bucket[key].indexOf(fn) == -1) {
          bucket[key].push(fn); //only add a hook if it has not already been added (adding the same hook twice is now silently ignored)
        }
      }
      return this;
    };

    /**
     * @memberof Handsontable.Hooks#
     * @function once
     * @param {String} key Hook/Event name
     * @param {Function} fn Callback function
     * @param {Object} instance of Handsontable
     */
    PluginHookClass.prototype.once = function(key, fn, instance){

      if(Array.isArray(fn)){

        for(var i = 0, len = fn.length; i < len; i++){
          fn[i].runOnce = true;
          this.add(key, fn[i], instance);
        }

      } else {
        fn.runOnce = true;
        this.add(key, fn, instance);

      }

    };

    /**
     * @memberof Handsontable.Hooks#
     * @function remove
     * @param {String} key Hook/Event name
     * @param {Function} fn Callback function
     * @param {Object} instance of Handsontable
     * @return {Boolean}
     */
    PluginHookClass.prototype.remove = function (key, fn, instance) {
      var status = false;

      // provide support for old versions of HOT
      if (key in legacy) {
        key = legacy[key];
      }

      var bucket = this.getBucket(instance);

      if (typeof bucket[key] !== 'undefined') {

        for (var i = 0, leni = bucket[key].length; i < leni; i++) {

          if (bucket[key][i] == fn) {
            bucket[key][i].skip = true;
            status = true;
            break;
          }

        }

      }

      return status;
    };

    /**
     * @memberof Handsontable.Hooks#
     * @function run
     * @param {Object} instance of Handsontable
     * @param {String} key Hook/Event name
     * @param {*} p1
     * @param {*} p2
     * @param {*} p3
     * @param {*} p4
     * @param {*} p5
     * @param {*} p6
     * @returns {*}
     */
    PluginHookClass.prototype.run = function (instance, key, p1, p2, p3, p4, p5, p6) {
      // provide support for old versions of HOT
      if (key in legacy) {
        key = legacy[key];
      }
      p1 = this._runBucket(this.globalBucket, instance, key, p1, p2, p3, p4, p5, p6);
      p1 = this._runBucket(this.getBucket(instance), instance, key, p1, p2, p3, p4, p5, p6);

      return p1;
    };

    PluginHookClass.prototype._runBucket = function (bucket, instance, key, p1, p2, p3, p4, p5, p6) {
      var handlers = bucket[key],
          res, i, len;

      // performance considerations - http://jsperf.com/call-vs-apply-for-a-plugin-architecture
      if (handlers) {
        for (i = 0, len = handlers.length; i < len; i++) {
          if (!handlers[i].skip) {
            res = handlers[i].call(instance, p1, p2, p3, p4, p5, p6);

            if (res !== void 0) {
              p1 = res;
            }

            if (handlers[i].runOnce) {
              this.remove(key, handlers[i], bucket === this.globalBucket ? null : instance);
            }
          }
        }
      }

      return p1;
    };

    PluginHookClass.prototype.destroy = function (instance) {
      var bucket = this.getBucket(instance);
      for (var key in bucket) {
        if (bucket.hasOwnProperty(key)) {
          for (var i = 0, leni = bucket[key].length; i < leni; i++) {
            this.remove(key, bucket[key], instance);
          }
        }
      }
    };

    /**
     * Registers a hook name (adds it to the list of the known hook names). Used by plugins. It is not neccessary to call,
     * register, but if you use it, your plugin hook will be used returned by getRegistered
     * (which itself is used in the demo http://handsontable.com/demo/callbacks.html)
     *
     * @memberof Handsontable.Hooks#
     * @function register
     * @private
     * @param key {String}
     */
    PluginHookClass.prototype.register = function (key) {
      if (!this.isRegistered(key)) {
        this.hooks[key] = [];
      }
    };

    /**
     * Deregisters a hook name (removes it from the list of known hook names)
     *
     * @memberof Handsontable.Hooks#
     * @function deregister
     * @private
     * @param key {String}
     */
    PluginHookClass.prototype.deregister = function (key) {
      delete this.hooks[key];
    };

    /**
     * Returns boolean information if a hook by such name has been registered
     *
     * @memberof Handsontable.Hooks#
     * @function isRegistered
     * @private
     * @param key {String}
     */
    PluginHookClass.prototype.isRegistered = function (key) {
      return (typeof this.hooks[key] !== "undefined");
    };

    /**
     * Returns an array of registered hooks
     *
     * @memberof Handsontable.Hooks#
     * @function getRegistered
     * @private
     * @returns {Array}
     */
    PluginHookClass.prototype.getRegistered = function () {
      return Object.keys(this.hooks);
    };

    return PluginHookClass;

  })();

  Handsontable.hooks = new Handsontable.PluginHookClass();
  Handsontable.PluginHooks = Handsontable.hooks; //in future move this line to legacy.js

  /**
   * @plugin
   * @class Handsontable.AutoColumnSize
   */
  (function (Handsontable) {

    function HandsontableAutoColumnSize() {
      var plugin = this
          , sampleCount = 5; //number of samples to take of each value length

      /**
       * @private
       * @function beforeInit
       * @memberof Handsontable.AutoColumnSize#
       */
      this.beforeInit = function () {
        var instance = this;
        instance.autoColumnWidths = [];

        if (instance.getSettings().autoColumnSize !== false) {
          if (!instance.autoColumnSizeTmp) {
            instance.autoColumnSizeTmp = {
              table: null,
              tableStyle: null,
              theadTh: null,
              tbody: null,
              container: null,
              containerStyle: null,
              determineBeforeNextRender: true
            };

            instance.addHook('beforeRender', htAutoColumnSize.determineIfChanged);
            instance.addHook('modifyColWidth', htAutoColumnSize.modifyColWidth);
            instance.addHook('afterDestroy', htAutoColumnSize.afterDestroy);

            /**
             * {@link Handsontable.AutoColumnSize#determineColumnWidth}
             *
             * @function determineColumnWidth
             * @alias determineColumnWidth
             * @memberof! Handsontable.Core#
             */
            instance.determineColumnWidth = plugin.determineColumnWidth;
          }
        } else {
          if (instance.autoColumnSizeTmp) {
            instance.removeHook('beforeRender', htAutoColumnSize.determineIfChanged);
            instance.removeHook('modifyColWidth', htAutoColumnSize.modifyColWidth);
            instance.removeHook('afterDestroy', htAutoColumnSize.afterDestroy);

            delete instance.determineColumnWidth;

            plugin.afterDestroy.call(instance);
          }
        }
      };

      /**
       * @private
       * @function determineIfChanged
       * @memberof Handsontable.AutoColumnSize#
       * @param {Boolean} [force]
       */
      this.determineIfChanged = function (force) {
        if (force) {
          htAutoColumnSize.determineColumnsWidth.apply(this, arguments);
        }
      };

      /**
       * Get width column.
       *
       * @function determineColumnWidth
       * @memberof Handsontable.AutoColumnSize#
       * @param {Number} col
       * @returns {Number}
       */
      this.determineColumnWidth = function (col) {
        var instance = this
            , tmp = instance.autoColumnSizeTmp;

        if (!tmp.container) {
          createTmpContainer.call(tmp, instance);
        }

        tmp.container.className = instance.rootElement.className + ' htAutoColumnSize';
        tmp.table.className = instance.table.className;

        var rows = instance.countRows();
        var samples = {};
        var maxLen = 0;
        for (var r = 0; r < rows; r++) {
          var value = Handsontable.helper.stringify(instance.getDataAtCell(r, col));
          var len = value.length;
          if (len > maxLen) {
            maxLen = len;
          }
          if (!samples[len]) {
            samples[len] = {
              needed: sampleCount,
              strings: []
            };
          }
          if (samples[len].needed) {
            samples[len].strings.push({value: value, row: r});
            samples[len].needed--;
          }
        }

        var settings = instance.getSettings();
        if (settings.colHeaders) {
          instance.view.appendColHeader(col, tmp.theadTh); //TH innerHTML
        }

        Handsontable.Dom.empty(tmp.tbody);

        for (var i in samples) {
          if (samples.hasOwnProperty(i)) {
            for (var j = 0, jlen = samples[i].strings.length; j < jlen; j++) {
              var row = samples[i].strings[j].row;

              var cellProperties = instance.getCellMeta(row, col);
              cellProperties.col = col;
              cellProperties.row = row;

              var renderer = instance.getCellRenderer(cellProperties);

              var tr = document.createElement('tr');
              var td = document.createElement('td');

              renderer(instance, td, row, col, instance.colToProp(col), samples[i].strings[j].value, cellProperties);
              r++;
              tr.appendChild(td);
              tmp.tbody.appendChild(tr);
            }
          }
        }

        var parent = instance.rootElement.parentNode;
        parent.appendChild(tmp.container);
        var width = Handsontable.Dom.outerWidth(tmp.table);
        parent.removeChild(tmp.container);

        return width;
      };

      /**
       * @private
       * @function determineColumnsWidth
       * @memberof Handsontable.AutoColumnSize#
       */
      this.determineColumnsWidth = function () {
        var instance = this;
        var settings = this.getSettings();
        if (settings.autoColumnSize || !settings.colWidths) {
          var cols = this.countCols();
          for (var c = 0; c < cols; c++) {
            if (!instance._getColWidthFromSettings(c)) {
              this.autoColumnWidths[c] = plugin.determineColumnWidth.call(instance, c);
            }
          }
        }
      };

      /**
       * @private
       * @function modifyColWidth
       * @memberof Handsontable.AutoColumnSize#
       * @param {Number} width
       * @param {Number} col
       * @returns {Number}
       */
      this.modifyColWidth = function (width, col) {
        if (this.autoColumnWidths[col] && this.autoColumnWidths[col] > width) {
          return this.autoColumnWidths[col];
        }
        return width;
      };

      /**
       * @private
       * @function afterDestroy
       * @memberof Handsontable.AutoColumnSize#
       */
      this.afterDestroy = function () {
        var instance = this;
        if (instance.autoColumnSizeTmp && instance.autoColumnSizeTmp.container && instance.autoColumnSizeTmp.container.parentNode) {
          instance.autoColumnSizeTmp.container.parentNode.removeChild(instance.autoColumnSizeTmp.container);
        }
        instance.autoColumnSizeTmp = null;
      };

      function createTmpContainer(instance) {
        var d = document
            , tmp = this;

        tmp.table = d.createElement('table');
        tmp.theadTh = d.createElement('th');
        tmp.table.appendChild(d.createElement('thead')).appendChild(d.createElement('tr')).appendChild(tmp.theadTh);

        tmp.tableStyle = tmp.table.style;
        tmp.tableStyle.tableLayout = 'auto';
        tmp.tableStyle.width = 'auto';

        tmp.tbody = d.createElement('tbody');
        tmp.table.appendChild(tmp.tbody);

        tmp.container = d.createElement('div');
        tmp.container.className = instance.rootElement.className + ' hidden';
//      tmp.container.className = instance.rootElement[0].className + ' hidden';
        tmp.containerStyle = tmp.container.style;

        tmp.container.appendChild(tmp.table);
      }
    }

    var htAutoColumnSize = new HandsontableAutoColumnSize();

    Handsontable.hooks.add('beforeInit', htAutoColumnSize.beforeInit);
    Handsontable.hooks.add('afterUpdateSettings', htAutoColumnSize.beforeInit);

  })(Handsontable);

  /**
   * This plugin sorts the view by a column (but does not sort the data source!)
   * @constructor
   * @private
   */
  function HandsontableColumnSorting() {
    var plugin = this;

    this.init = function (source) {
      var instance = this;
      var sortingSettings = instance.getSettings().columnSorting;
      var sortingColumn, sortingOrder;

      instance.sortingEnabled = !!(sortingSettings);

      if (instance.sortingEnabled) {
        instance.sortIndex = [];

        var loadedSortingState = loadSortingState.call(instance);

        if (typeof loadedSortingState != 'undefined') {
          sortingColumn = loadedSortingState.sortColumn;
          sortingOrder = loadedSortingState.sortOrder;
        } else {
          sortingColumn = sortingSettings.column;
          sortingOrder = sortingSettings.sortOrder;
        }
        plugin.sortByColumn.call(instance, sortingColumn, sortingOrder);

        instance.sort = function(){
          var args = Array.prototype.slice.call(arguments);

          return plugin.sortByColumn.apply(instance, args);
        };

        if (typeof instance.getSettings().observeChanges == 'undefined'){
          enableObserveChangesPlugin.call(instance);
        }

        if (source == 'afterInit') {
          bindColumnSortingAfterClick.call(instance);

          instance.addHook('afterCreateRow', plugin.afterCreateRow);
          instance.addHook('afterRemoveRow', plugin.afterRemoveRow);
          instance.addHook('afterLoadData', plugin.init);
        }
      } else {
        delete instance.sort;

        instance.removeHook('afterCreateRow', plugin.afterCreateRow);
        instance.removeHook('afterRemoveRow', plugin.afterRemoveRow);
        instance.removeHook('afterLoadData', plugin.init);
      }
    };

    this.setSortingColumn = function (col, order) {
      var instance = this;

      if (typeof col == 'undefined') {
        delete instance.sortColumn;
        delete instance.sortOrder;

        return;
      } else if (instance.sortColumn === col && typeof order == 'undefined') {
        instance.sortOrder = !instance.sortOrder;
      } else {
        instance.sortOrder = typeof order != 'undefined' ? order : true;
      }

      instance.sortColumn = col;

    };

    this.sortByColumn = function (col, order) {
      var instance = this;

      plugin.setSortingColumn.call(instance, col, order);

      if(typeof instance.sortColumn == 'undefined'){
        return;
      }

      Handsontable.hooks.run(instance, 'beforeColumnSort', instance.sortColumn, instance.sortOrder);

      plugin.sort.call(instance);
      instance.render();

      saveSortingState.call(instance);

      Handsontable.hooks.run(instance, 'afterColumnSort', instance.sortColumn, instance.sortOrder);
    };

    var saveSortingState = function () {
      var instance = this;

      var sortingState = {};

      if (typeof instance.sortColumn != 'undefined') {
        sortingState.sortColumn = instance.sortColumn;
      }

      if (typeof instance.sortOrder != 'undefined') {
        sortingState.sortOrder = instance.sortOrder;
      }

      if (sortingState.hasOwnProperty('sortColumn') || sortingState.hasOwnProperty('sortOrder')) {
        Handsontable.hooks.run(instance, 'persistentStateSave', 'columnSorting', sortingState);
      }

    };

    var loadSortingState = function () {
      var instance = this;
      var storedState = {};
      Handsontable.hooks.run(instance, 'persistentStateLoad', 'columnSorting', storedState);

      return storedState.value;
    };

    var bindColumnSortingAfterClick = function () {
      var instance = this;

      var eventManager = Handsontable.eventManager(instance);
      eventManager.addEventListener(instance.rootElement, 'click', function (e){
        if(Handsontable.Dom.hasClass(e.target, 'columnSorting')) {
          var col = getColumn(e.target);
          plugin.sortByColumn.call(instance, col);
        }
      });

      function countRowHeaders() {
        var THs = instance.view.TBODY.querySelector('tr').querySelectorAll('th');
        return THs.length;
      }

      function getColumn(target) {
        var TH = Handsontable.Dom.closest(target, 'TH');
        return Handsontable.Dom.index(TH) - countRowHeaders();
      }
    };

    function enableObserveChangesPlugin () {
      var instance = this;
      instance._registerTimeout(setTimeout(function(){
        instance.updateSettings({
          observeChanges: true
        });
      }, 0));
    }

    function defaultSort(sortOrder) {
      return function (a, b) {
        if(typeof a[1] == "string") {
          a[1] = a[1].toLowerCase();
        }
        if(typeof b[1] == "string") {
          b[1] = b[1].toLowerCase();
        }

        if (a[1] === b[1]) {
          return 0;
        }
        if (a[1] === null || a[1] === "") {
          return 1;
        }
        if (b[1] === null || b[1] === "") {
          return -1;
        }
        if (a[1] < b[1]) {
          return sortOrder ? -1 : 1;
        }
        if (a[1] > b[1]) {
          return sortOrder ? 1 : -1;
        }
        return 0;
      };
    }

    function dateSort(sortOrder) {
      return function (a, b) {
        if (a[1] === b[1]) {
          return 0;
        }
        if (a[1] === null) {
          return 1;
        }
        if (b[1] === null) {
          return -1;
        }

        var aDate = new Date(a[1]);
        var bDate = new Date(b[1]);

        if (aDate < bDate) {
          return sortOrder ? -1 : 1;
        }
        if (aDate > bDate) {
          return sortOrder ? 1 : -1;
        }

        return 0;
      };
    }

    this.sort = function () {
      var instance = this;

      if (typeof instance.sortOrder == 'undefined') {
        return;
      }

      instance.sortingEnabled = false; //this is required by translateRow plugin hook
      instance.sortIndex.length = 0;

      var colOffset = this.colOffset();
      for (var i = 0, ilen = this.countRows() - instance.getSettings()['minSpareRows']; i < ilen; i++) {
        this.sortIndex.push([i, instance.getDataAtCell(i, this.sortColumn + colOffset)]);
      }

      var colMeta = instance.getCellMeta(0, instance.sortColumn);
      var sortFunction;
      switch (colMeta.type) {
        case 'date':
          sortFunction = dateSort;
          break;
        default:
          sortFunction = defaultSort;
      }

      this.sortIndex.sort(sortFunction(instance.sortOrder));

      //Append spareRows
      for(var i = this.sortIndex.length; i < instance.countRows(); i++){
        this.sortIndex.push([i, instance.getDataAtCell(i, this.sortColumn + colOffset)]);
      }

      instance.sortingEnabled = true; //this is required by translateRow plugin hook
    };

    this.translateRow = function (row) {
      var instance = this;

      if (instance.sortingEnabled && instance.sortIndex && instance.sortIndex.length && instance.sortIndex[row]) {
        return instance.sortIndex[row][0];
      }

      return row;
    };

    this.untranslateRow = function (row) {
      var instance = this;
      if (instance.sortingEnabled && instance.sortIndex && instance.sortIndex.length) {
        for (var i = 0; i < instance.sortIndex.length; i++) {
          if (instance.sortIndex[i][0] == row) {
            return i;
          }
        }
      }
    };

    this.getColHeader = function (col, TH) {
      if (this.getSettings().columnSorting && col >= 0) {
        Handsontable.Dom.addClass(TH.querySelector('.colHeader'), 'columnSorting');
      }
    };

    function isSorted(instance){
      return typeof instance.sortColumn != 'undefined';
    }

    this.afterCreateRow = function(index, amount){
      var instance = this;

      if(!isSorted(instance)){
        return;
      }


      for(var i = 0; i < instance.sortIndex.length; i++){
        if (instance.sortIndex[i][0] >= index){
          instance.sortIndex[i][0] += amount;
        }
      }

      for(var i=0; i < amount; i++){
        instance.sortIndex.splice(index+i, 0, [index+i, instance.getData()[index+i][instance.sortColumn + instance.colOffset()]]);
      }



      saveSortingState.call(instance);

    };

    this.afterRemoveRow = function(index, amount){
      var instance = this;

      if(!isSorted(instance)){
        return;
      }

      var physicalRemovedIndex = plugin.translateRow.call(instance, index);

      instance.sortIndex.splice(index, amount);

      for(var i = 0; i < instance.sortIndex.length; i++){

        if (instance.sortIndex[i][0] > physicalRemovedIndex){
          instance.sortIndex[i][0] -= amount;
        }
      }

      saveSortingState.call(instance);

    };

    this.afterChangeSort = function (changes/*, source*/) {
      var instance = this;
      var sortColumnChanged = false;
      var selection = {};
      if (!changes) {
        return;
      }

      for (var i = 0; i < changes.length; i++) {
        if (changes[i][1] == instance.sortColumn) {
          sortColumnChanged = true;
          selection.row = plugin.translateRow.call(instance, changes[i][0]);
          selection.col = changes[i][1];
          break;
        }
      }

      if (sortColumnChanged) {
        instance._registerTimeout(setTimeout(function () {
          plugin.sort.call(instance);
          instance.render();
          instance.selectCell(plugin.untranslateRow.call(instance, selection.row), selection.col);
        }, 0));
      }
    };
  }
  var htSortColumn = new HandsontableColumnSorting();

  Handsontable.hooks.add('afterInit', function () {
    htSortColumn.init.call(this, 'afterInit');
  });
  Handsontable.hooks.add('afterUpdateSettings', function () {
    htSortColumn.init.call(this, 'afterUpdateSettings');
  });
  Handsontable.hooks.add('modifyRow', htSortColumn.translateRow);
  Handsontable.hooks.add('afterGetColHeader', htSortColumn.getColHeader);

  Handsontable.hooks.register('beforeColumnSort');
  Handsontable.hooks.register('afterColumnSort');


  (function (Handsontable) {
    'use strict';

    function prepareVerticalAlignClass(className, alignment) {
      if (className.indexOf(alignment) != -1) {
        return className;
      }

      className = className
          .replace('htTop', '')
          .replace('htMiddle', '')
          .replace('htBottom', '')
          .replace('  ', '');

      className += " " + alignment;
      return className;
    }

    function prepareHorizontalAlignClass(className, alignment) {
      if (className.indexOf(alignment) != -1) {
        return className;
      }

      className = className
          .replace('htLeft', '')
          .replace('htCenter', '')
          .replace('htRight', '')
          .replace('htJustify', '')
          .replace('  ', '');

      className += " " + alignment;
      return className;
    }

    function getAlignmentClasses(range) {
      var classesArray = {};
      /* jshint ignore:start */
      for (var row = range.from.row; row <= range.to.row; row++) {
        for (var col = range.from.col; col <= range.to.col; col++) {

          if(!classesArray[row]) {
            classesArray[row] = [];
          }
          classesArray[row][col] = this.getCellMeta(row,col).className;
        }
      }
      /* jshint ignore:end */

      return classesArray;
    }

    function doAlign(row, col, type, alignment) {
      /* jshint ignore:start */
      var cellMeta = this.getCellMeta(row, col),
          className = alignment;

      if (cellMeta.className) {
        if (type === 'vertical') {
          className = prepareVerticalAlignClass(cellMeta.className, alignment);
        } else {
          className = prepareHorizontalAlignClass(cellMeta.className, alignment);
        }
      }

      this.setCellMeta(row, col, 'className', className);
      /* jshint ignore:end */
    }

    function align(range, type, alignment) {
      /* jshint ignore:start */

      var stateBefore = getAlignmentClasses.call(this, range);
      this.runHooks('beforeCellAlignment', stateBefore, range, type, alignment);

      if (range.from.row == range.to.row && range.from.col == range.to.col) {
        doAlign.call(this, range.from.row, range.from.col, type, alignment);
      } else {
        for (var row = range.from.row; row <= range.to.row; row++) {
          for (var col = range.from.col; col <= range.to.col; col++) {
            doAlign.call(this, row, col, type, alignment);
          }
        }
      }

      this.render();

      /* jshint ignore:end */
    }

    function ContextMenu(instance, customOptions) {
      this.instance = instance;
      var contextMenu = this;
      contextMenu.menus = [];
      contextMenu.htMenus = {};
      contextMenu.triggerRows = [];

      contextMenu.eventManager = Handsontable.eventManager(contextMenu);


      this.enabled = true;

      this.instance.addHook('afterDestroy', function () {
        contextMenu.destroy();
      });

      this.defaultOptions = {
        items: [
          {
            key: 'row_above',
            name: 'Insert row above',
            callback: function (key, selection) {
              this.alter("insert_row", selection.start.row);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireColumnSelection = [0, selected[1], this.countRows() - 1, selected[1]],
                  columnSelected = entireColumnSelection.join(',') == selected.join(',');

              return selected[0] < 0 || this.countRows() >= this.getSettings().maxRows || columnSelected;
            }
          },
          {
            key: 'row_below',
            name: 'Insert row below',
            callback: function (key, selection) {
              this.alter("insert_row", selection.end.row + 1);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireColumnSelection = [0, selected[1], this.countRows() - 1, selected[1]],
                  columnSelected = entireColumnSelection.join(',') == selected.join(',');

              return this.getSelected()[0] < 0 || this.countRows() >= this.getSettings().maxRows || columnSelected;
            }
          },
          ContextMenu.SEPARATOR,
          {
            key: 'col_left',
            name: 'Insert column on the left',
            callback: function (key, selection) {
              this.alter("insert_col", selection.start.col);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireRowSelection = [selected[0], 0, selected[0], this.countCols() - 1],
                  rowSelected = entireRowSelection.join(',') == selected.join(',');

              return this.getSelected()[1] < 0 || this.countCols() >= this.getSettings().maxCols || rowSelected;
            }
          },
          {
            key: 'col_right',
            name: 'Insert column on the right',
            callback: function (key, selection) {
              this.alter("insert_col", selection.end.col + 1);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireRowSelection = [selected[0], 0, selected[0], this.countCols() - 1],
                  rowSelected = entireRowSelection.join(',') == selected.join(',');

              return selected[1] < 0 || this.countCols() >= this.getSettings().maxCols || rowSelected;
            }
          },
          ContextMenu.SEPARATOR,
          {
            key: 'remove_row',
            name: 'Remove row',
            callback: function (key, selection) {
              var amount = selection.end.row - selection.start.row + 1;
              this.alter("remove_row", selection.start.row, amount);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireColumnSelection = [0, selected[1], this.countRows() - 1, selected[1]],
                  columnSelected = entireColumnSelection.join(',') == selected.join(',');
              return (selected[0] < 0 || columnSelected);
            }
          },
          {
            key: 'remove_col',
            name: 'Remove column',
            callback: function (key, selection) {
              var amount = selection.end.col - selection.start.col + 1;
              this.alter("remove_col", selection.start.col, amount);
            },
            disabled: function () {
              var selected = this.getSelected(),
                  entireRowSelection = [selected[0], 0, selected[0], this.countCols() - 1],
                  rowSelected = entireRowSelection.join(',') == selected.join(',');
              return (selected[1] < 0 || rowSelected);
            }
          },
          ContextMenu.SEPARATOR,
          {
            key: 'undo',
            name: 'Undo',
            callback: function () {
              this.undo();
            },
            disabled: function () {
              return this.undoRedo && !this.undoRedo.isUndoAvailable();
            }
          },
          {
            key: 'redo',
            name: 'Redo',
            callback: function () {
              this.redo();
            },
            disabled: function () {
              return this.undoRedo && !this.undoRedo.isRedoAvailable();
            }
          },
          ContextMenu.SEPARATOR,
          {
            key: 'make_read_only',
            name: function () {
              var label = "Read only";
              var atLeastOneReadOnly = contextMenu.checkSelectionReadOnlyConsistency(this);
              if (atLeastOneReadOnly) {
                label = contextMenu.markSelected(label);
              }
              return label;
            },
            callback: function () {
              var atLeastOneReadOnly = contextMenu.checkSelectionReadOnlyConsistency(this);

              var that = this;
              this.getSelectedRange().forAll(function (r, c) {
                that.getCellMeta(r, c).readOnly = atLeastOneReadOnly ? false : true;
              });

              this.render();
            }
          },
          ContextMenu.SEPARATOR,
          {
            key: 'alignment',
            name: 'Alignment',
            submenu: {
              items: [
                {
                  name: function () {
                    var label = "Left";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htLeft');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'horizontal', 'htLeft');
                  },
                  disabled: false
                },
                {
                  name: function () {
                    var label = "Center";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htCenter');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'horizontal', 'htCenter');
                  },
                  disabled: false
                },
                {
                  name: function () {
                    var label = "Right";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htRight');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'horizontal', 'htRight');
                  },
                  disabled: false
                },
                {
                  name: function () {
                    var label = "Justify";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htJustify');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'horizontal', 'htJustify');
                  },
                  disabled: false
                },
                ContextMenu.SEPARATOR,
                {
                  name: function () {
                    var label = "Top";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htTop');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'vertical', 'htTop');
                  },
                  disabled: false
                },
                {
                  name: function () {
                    var label = "Middle";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htMiddle');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'vertical', 'htMiddle');
                  },
                  disabled: false
                },
                {
                  name: function () {
                    var label = "Bottom";
                    var hasClass = contextMenu.checkSelectionAlignment(this, 'htBottom');

                    if (hasClass) {
                      label = contextMenu.markSelected(label);
                    }
                    return label;
                  },
                  callback: function () {
                    align.call(this, this.getSelectedRange(), 'vertical', 'htBottom');
                  },
                  disabled: false
                }
              ]
            }
          }
        ]
      };

      contextMenu.options = {};

      Handsontable.helper.extend(contextMenu.options, this.options);

      this.bindMouseEvents();

      this.markSelected = function (label) {
        return "<span class='selected'>" + String.fromCharCode(10003) + "</span>" + label; // workaround for https://github.com/handsontable/handsontable/issues/1946
      };

      this.checkSelectionAlignment = function (hot, className) {
        var hasAlignment = false;

        hot.getSelectedRange().forAll(function (r, c) {
          var metaClassName = hot.getCellMeta(r, c).className;
          if (metaClassName && metaClassName.indexOf(className) != -1) {
            hasAlignment = true;
            return false;
          }
        });

        return hasAlignment;
      };

      if(!this.instance.getSettings().allowInsertRow) {
        var rowAboveIndex = findIndexByKey(this.defaultOptions.items, 'row_above');
        this.defaultOptions.items.splice(rowAboveIndex,1);
        var rowBelowIndex = findIndexByKey(this.defaultOptions.items, 'row_above');
        this.defaultOptions.items.splice(rowBelowIndex,1);
        this.defaultOptions.items.splice(rowBelowIndex,1); // FOR SEPARATOR

      }

      if(!this.instance.getSettings().allowInsertColumn) {
        var colLeftIndex = findIndexByKey(this.defaultOptions.items, 'col_left');
        this.defaultOptions.items.splice(colLeftIndex,1);
        var colRightIndex = findIndexByKey(this.defaultOptions.items, 'col_right');
        this.defaultOptions.items.splice(colRightIndex,1);
        this.defaultOptions.items.splice(colRightIndex,1); // FOR SEPARATOR

      }

      var removeRow = false;
      var removeCol = false;
      var removeRowIndex, removeColumnIndex;

      if(!this.instance.getSettings().allowRemoveRow) {
        removeRowIndex = findIndexByKey(this.defaultOptions.items, 'remove_row');
        this.defaultOptions.items.splice(removeRowIndex,1);
        removeRow = true;
      }

      if(!this.instance.getSettings().allowRemoveColumn) {
        removeColumnIndex = findIndexByKey(this.defaultOptions.items, 'remove_col');
        this.defaultOptions.items.splice(removeColumnIndex,1);
        removeCol = true;
      }

      if (removeRow && removeCol) {
        this.defaultOptions.items.splice(removeColumnIndex,1); // SEPARATOR
      }

      this.checkSelectionReadOnlyConsistency = function (hot) {
        var atLeastOneReadOnly = false;

        hot.getSelectedRange().forAll(function (r, c) {
          if (hot.getCellMeta(r, c).readOnly) {
            atLeastOneReadOnly = true;
            return false; //breaks forAll
          }
        });

        return atLeastOneReadOnly;
      };

      Handsontable.hooks.run(instance, 'afterContextMenuDefaultOptions', this.defaultOptions);

    }

    /***
     * Create DOM instance of contextMenu
     * @param menuName
     * @param row
     * @return {*}
     */
    ContextMenu.prototype.createMenu = function (menuName, row) {
      if (menuName) {
        menuName = menuName.replace(/ /g, '_'); // replace all spaces in name
        menuName = 'htContextSubMenu_' + menuName;
      }

      var menu;
      if (menuName) {
        menu = document.querySelector('.htContextMenu.' + menuName);
      } else {
        menu = document.querySelector('.htContextMenu');
      }


      if (!menu) {
        menu = document.createElement('DIV');
        Handsontable.Dom.addClass(menu, 'htContextMenu');
        if (menuName) {
          Handsontable.Dom.addClass(menu, menuName);
        }
        document.getElementsByTagName('body')[0].appendChild(menu);
      }

      if (this.menus.indexOf(menu) < 0) {
        this.menus.push(menu);
        row = row || 0;
        this.triggerRows.push(row);
      }

      return menu;
    };

    ContextMenu.prototype.bindMouseEvents = function () {
      /* jshint ignore:start */
      function contextMenuOpenListener(event) {
        var settings = this.instance.getSettings(),
            showRowHeaders = this.instance.getSettings().rowHeaders,
            showColHeaders = this.instance.getSettings().colHeaders,
            containsCornerHeader,
            element,
            items,
            menu;

        function isValidElement(element) {
          return element.nodeName === 'TD' || element.parentNode.nodeName === 'TD';
        }
        // if event is from hot-table we must get web component element not element inside him
        element = event.realTarget;
        this.closeAll();

        event.preventDefault();
        Handsontable.helper.stopPropagation(event);

        if (!(showRowHeaders || showColHeaders)) {
          if (!isValidElement(element) &&
              !(Handsontable.Dom.hasClass(element, 'current') && Handsontable.Dom.hasClass(element, 'wtBorder'))) {
            return;
          }
        } else if(showRowHeaders && showColHeaders) {
          // do nothing after right-click on corner header
          containsCornerHeader = element.parentNode.querySelectorAll('.cornerHeader').length > 0;

          if (containsCornerHeader) {
            return;
          }
        }
        menu = this.createMenu();
        items = this.getItems(settings.contextMenu);

        this.show(menu, items);
        this.setMenuPosition(event, menu);
        this.eventManager.addEventListener(document.documentElement, 'mousedown', Handsontable.helper.proxy(ContextMenu.prototype.closeAll, this));
      }
      /* jshint ignore:end */
      var eventManager = Handsontable.eventManager(this.instance);

      eventManager.addEventListener(this.instance.rootElement, 'contextmenu', Handsontable.helper.proxy(contextMenuOpenListener, this));
    };

    ContextMenu.prototype.bindTableEvents = function () {
      this._afterScrollCallback = function () {};
      this.instance.addHook('afterScrollVertically', this._afterScrollCallback);
      this.instance.addHook('afterScrollHorizontally', this._afterScrollCallback);
    };

    ContextMenu.prototype.unbindTableEvents = function () {
      if (this._afterScrollCallback) {
        this.instance.removeHook('afterScrollVertically', this._afterScrollCallback);
        this.instance.removeHook('afterScrollHorizontally', this._afterScrollCallback);
        this._afterScrollCallback = null;
      }
    };

    ContextMenu.prototype.performAction = function (event, hot) {
      var contextMenu = this;

      var selectedItemIndex = hot.getSelected()[0];
      var selectedItem = hot.getData()[selectedItemIndex];

      if (selectedItem.disabled === true || (typeof selectedItem.disabled == 'function' && selectedItem.disabled.call(this.instance) === true)) {
        return;
      }

      if (!selectedItem.hasOwnProperty('submenu')) {
        if (typeof selectedItem.callback != 'function') {
          return;
        }
        var selRange = this.instance.getSelectedRange();
        var normalizedSelection = ContextMenu.utils.normalizeSelection(selRange);

        selectedItem.callback.call(this.instance, selectedItem.key, normalizedSelection, event);
        contextMenu.closeAll();
      }
    };

    ContextMenu.prototype.unbindMouseEvents = function () {
      this.eventManager.clear();
      var eventManager = Handsontable.eventManager(this.instance);
      eventManager.removeEventListener(this.instance.rootElement, 'contextmenu');
    };

    ContextMenu.prototype.show = function (menu, items) {
      var that = this;

      menu.removeAttribute('style');
      menu.style.display = 'block';

      var settings = {
        data: items,
        colHeaders: false,
        colWidths: [200],
        readOnly: true,
        copyPaste: false,
        columns: [
          {
            data: 'name',
            renderer: Handsontable.helper.proxy(this.renderer, this)
          }
        ],
        renderAllRows: true,
        beforeKeyDown: function (event) {
          that.onBeforeKeyDown(event, htContextMenu);
        },
        afterOnCellMouseOver: function (event, coords, TD) {
          that.onCellMouseOver(event, coords, TD, htContextMenu);
        }
      };

      var htContextMenu = new Handsontable(menu, settings);

      // ContextMenu is not detected HotTableEnv correctly because is injected outside hot-table
      htContextMenu.isHotTableEnv = this.instance.isHotTableEnv;
      Handsontable.eventManager.isHotTableEnv = this.instance.isHotTableEnv;

      this.eventManager.removeEventListener(menu, 'mousedown');
      this.eventManager.addEventListener(menu,'mousedown', function (event) {
        that.performAction(event, htContextMenu);
      });

      this.bindTableEvents();
      htContextMenu.listen();

      this.htMenus[htContextMenu.guid] = htContextMenu;
    };

    ContextMenu.prototype.close = function (menu) {
      this.hide(menu);
      this.eventManager.clear();
      this.unbindTableEvents();
      this.instance.listen();
    };

    ContextMenu.prototype.closeAll = function () {
      while (this.menus.length > 0) {
        var menu = this.menus.pop();
        if (menu) {
          this.close(menu);
        }

      }
      this.triggerRows = [];
    };

    ContextMenu.prototype.closeLastOpenedSubMenu = function () {
      var menu = this.menus.pop();
      if (menu) {
        this.hide(menu);
      }

    };

    ContextMenu.prototype.hide = function (menu) {
      menu.style.display = 'none';
      var instance =this.htMenus[menu.id];

      instance.destroy();
      delete this.htMenus[menu.id];
    };

    ContextMenu.prototype.renderer = function (instance, TD, row, col, prop, value) {
      var contextMenu = this;
      var item = instance.getData()[row];
      var wrapper = document.createElement('DIV');

      if (typeof value === 'function') {
        value = value.call(this.instance);
      }

      Handsontable.Dom.empty(TD);
      TD.appendChild(wrapper);

      if (itemIsSeparator(item)) {
        Handsontable.Dom.addClass(TD, 'htSeparator');
      } else {
        Handsontable.Dom.fastInnerHTML(wrapper, value);
      }

      if (itemIsDisabled(item)) {
        Handsontable.Dom.addClass(TD, 'htDisabled');

        this.eventManager.addEventListener(wrapper, 'mouseenter', function () {
          instance.deselectCell();
        });

      } else {
        if (isSubMenu(item)) {
          Handsontable.Dom.addClass(TD, 'htSubmenu');


          this.eventManager.addEventListener(wrapper, 'mouseenter', function () {
            instance.selectCell(row, col);
          });

        } else {
          Handsontable.Dom.removeClass(TD, 'htSubmenu');
          Handsontable.Dom.removeClass(TD, 'htDisabled');

          this.eventManager.addEventListener(wrapper, 'mouseenter', function () {
            instance.selectCell(row, col);
          });
        }
      }


      function isSubMenu(item) {
        return item.hasOwnProperty('submenu');
      }

      function itemIsSeparator(item) {
        return new RegExp(ContextMenu.SEPARATOR.name, 'i').test(item.name);
      }

      function itemIsDisabled(item) {
        return item.disabled === true || (typeof item.disabled == 'function' && item.disabled.call(contextMenu.instance) === true);
      }


    };

    ContextMenu.prototype.onCellMouseOver = function (event, coords, TD, hot) {
      var menusLength = this.menus.length;

      if (menusLength > 0) {
        var lastMenu = this.menus[menusLength - 1];
        if (lastMenu.id != hot.guid) {
          this.closeLastOpenedSubMenu();
        }
      } else {
        this.closeLastOpenedSubMenu();
      }

      if (TD.className.indexOf('htSubmenu') != -1) {
        var selectedItem = hot.getData()[coords.row];
        var items = this.getItems(selectedItem.submenu);

        var subMenu = this.createMenu(selectedItem.name, coords.row);
        var tdCoords = TD.getBoundingClientRect();

        this.show(subMenu, items);
        this.setSubMenuPosition(tdCoords, subMenu);

      }
    };

    ContextMenu.prototype.onBeforeKeyDown = function (event, instance) {

      Handsontable.Dom.enableImmediatePropagation(event);
      var contextMenu = this;

      var selection = instance.getSelected();

      switch (event.keyCode) {

        case Handsontable.helper.keyCode.ESCAPE:
          contextMenu.closeAll();
          event.preventDefault();
          event.stopImmediatePropagation();
          break;

        case Handsontable.helper.keyCode.ENTER:
          if (selection) {
            contextMenu.performAction(event, instance);
          }
          break;

        case Handsontable.helper.keyCode.ARROW_DOWN:

          if (!selection) {

            selectFirstCell(instance, contextMenu);

          } else {

            selectNextCell(selection[0], selection[1], instance, contextMenu);

          }

          event.preventDefault();
          event.stopImmediatePropagation();

          break;

        case Handsontable.helper.keyCode.ARROW_UP:
          if (!selection) {

            selectLastCell(instance, contextMenu);

          } else {

            selectPrevCell(selection[0], selection[1], instance, contextMenu);

          }

          event.preventDefault();
          event.stopImmediatePropagation();

          break;
        case Handsontable.helper.keyCode.ARROW_RIGHT:
          if (selection) {
            var row = selection[0];
            var cell = instance.getCell(selection[0], 0);

            if (ContextMenu.utils.hasSubMenu(cell)) {
              openSubMenu(instance, contextMenu, cell, row);
            }
          }
          event.preventDefault();
          event.stopImmediatePropagation();

          break;

        case Handsontable.helper.keyCode.ARROW_LEFT:
          if (selection) {

            if (instance.rootElement.className.indexOf('htContextSubMenu_') != -1) {
              contextMenu.closeLastOpenedSubMenu();
              var index = contextMenu.menus.length;

              if (index > 0) {
                var menu = contextMenu.menus[index - 1];

                var triggerRow = contextMenu.triggerRows.pop();
                instance = this.htMenus[menu.id];
                instance.selectCell(triggerRow, 0);
              }
            }
            event.preventDefault();
            event.stopImmediatePropagation();
          }
          break;
      }

      function selectFirstCell(instance) {

        var firstCell = instance.getCell(0, 0);

        if (ContextMenu.utils.isSeparator(firstCell) || ContextMenu.utils.isDisabled(firstCell)) {
          selectNextCell(0, 0, instance);
        } else {
          instance.selectCell(0, 0);
        }

      }


      function selectLastCell(instance) {

        var lastRow = instance.countRows() - 1;
        var lastCell = instance.getCell(lastRow, 0);

        if (ContextMenu.utils.isSeparator(lastCell) || ContextMenu.utils.isDisabled(lastCell)) {
          selectPrevCell(lastRow, 0, instance);
        } else {
          instance.selectCell(lastRow, 0);
        }

      }

      function selectNextCell(row, col, instance) {
        var nextRow = row + 1;
        var nextCell = nextRow < instance.countRows() ? instance.getCell(nextRow, col) : null;

        if (!nextCell) {
          return;
        }

        if (ContextMenu.utils.isSeparator(nextCell) || ContextMenu.utils.isDisabled(nextCell)) {
          selectNextCell(nextRow, col, instance);
        } else {
          instance.selectCell(nextRow, col);
        }
      }

      function selectPrevCell(row, col, instance) {

        var prevRow = row - 1;
        var prevCell = prevRow >= 0 ? instance.getCell(prevRow, col) : null;

        if (!prevCell) {
          return;
        }

        if (ContextMenu.utils.isSeparator(prevCell) || ContextMenu.utils.isDisabled(prevCell)) {
          selectPrevCell(prevRow, col, instance);
        } else {
          instance.selectCell(prevRow, col);
        }

      }

      function openSubMenu(instance, contextMenu, cell, row) {
        var selectedItem = instance.getData()[row];
        var items = contextMenu.getItems(selectedItem.submenu);
        var subMenu = contextMenu.createMenu(selectedItem.name, row);
        var coords = cell.getBoundingClientRect();
        var subMenuInstance = contextMenu.show(subMenu, items);

        contextMenu.setSubMenuPosition(coords, subMenu);
        subMenuInstance.selectCell(0, 0);
      }
    };

    function findByKey(items, key) {
      for (var i = 0, ilen = items.length; i < ilen; i++) {
        if (items[i].key === key) {
          return items[i];
        }
      }
    }

    function findIndexByKey(items, key) {
      for (var i = 0, ilen = items.length; i < ilen; i++) {
        if (items[i].key === key) {
          return i;
        }
      }
    }

    ContextMenu.prototype.getItems = function (items) {
      var menu, item;

      function ContextMenuItem(rawItem) {
        if (typeof rawItem == 'string') {
          this.name = rawItem;
        } else {
          Handsontable.helper.extend(this, rawItem);
        }
      }

      ContextMenuItem.prototype = items;

      if (items && items.items) {
        items = items.items;
      }

      if (items === true) {
        items = this.defaultOptions.items;
      }

      if (1 == 1) {
        menu = [];
        for (var key in items) {
          if (items.hasOwnProperty(key)) {
            if (typeof items[key] === 'string') {
              item = findByKey(this.defaultOptions.items, items[key]);
            }
            else {
              item = findByKey(this.defaultOptions.items, key);
            }
            if (!item) {
              item = items[key];
            }
            item = new ContextMenuItem(item);
            if (typeof items[key] === 'object') {
              Handsontable.helper.extend(item, items[key]);
            }
            if (!item.key) {
              item.key = key;
            }
            menu.push(item);
          }
        }
      }

      return menu;
    };

    ContextMenu.prototype.setSubMenuPosition = function (coords, menu) {
      var scrollTop = Handsontable.Dom.getWindowScrollTop();
      var scrollLeft = Handsontable.Dom.getWindowScrollLeft();

      var cursor = {
        top: scrollTop + coords.top,
        topRelative: coords.top,
        left: coords.left,
        leftRelative: coords.left - scrollLeft,
        scrollTop: scrollTop,
        scrollLeft: scrollLeft,
        cellHeight: coords.height,
        cellWidth: coords.width
      };

      if (this.menuFitsBelowCursor(cursor, menu, document.body.clientWidth)) {
        this.positionMenuBelowCursor(cursor, menu, true);
      } else {
        if (this.menuFitsAboveCursor(cursor, menu)) {
          this.positionMenuAboveCursor(cursor, menu, true);
        } else {
          this.positionMenuBelowCursor(cursor, menu, true);
        }
      }

      if (this.menuFitsOnRightOfCursor(cursor, menu, document.body.clientWidth)) {
        this.positionMenuOnRightOfCursor(cursor, menu, true);
      } else {
        this.positionMenuOnLeftOfCursor(cursor, menu, true);
      }
    };

    ContextMenu.prototype.setMenuPosition = function (event, menu) {
      // for ie8
      // http://msdn.microsoft.com/en-us/library/ie/ff974655(v=vs.85).aspx
      var scrollTop = Handsontable.Dom.getWindowScrollTop();
      var scrollLeft = Handsontable.Dom.getWindowScrollLeft();
      var cursorY = event.pageY || (event.clientY + scrollTop);
      var cursorX = event.pageX || (event.clientX + scrollLeft);

      var cursor = {
        top: cursorY,
        topRelative: cursorY - scrollTop,
        left: cursorX,
        leftRelative: cursorX - scrollLeft,
        scrollTop: scrollTop,
        scrollLeft: scrollLeft,
        cellHeight: event.target.clientHeight,
        cellWidth: event.target.clientWidth
      };

      if (this.menuFitsBelowCursor(cursor, menu, document.body.clientHeight)) {
        this.positionMenuBelowCursor(cursor, menu);
      } else {
        if (this.menuFitsAboveCursor(cursor, menu)) {
          this.positionMenuAboveCursor(cursor, menu);
        } else {
          this.positionMenuBelowCursor(cursor, menu);
        }
      }

      if (this.menuFitsOnRightOfCursor(cursor, menu, document.body.clientWidth)) {
        this.positionMenuOnRightOfCursor(cursor, menu);
      } else {
        this.positionMenuOnLeftOfCursor(cursor, menu);
      }

    };

    ContextMenu.prototype.menuFitsAboveCursor = function (cursor, menu) {
      return cursor.topRelative >= menu.offsetHeight;
    };

    ContextMenu.prototype.menuFitsBelowCursor = function (cursor, menu, viewportHeight) {
      return cursor.topRelative + menu.offsetHeight <= viewportHeight;
    };

    ContextMenu.prototype.menuFitsOnRightOfCursor = function (cursor, menu, viewportHeight) {
      return cursor.leftRelative + menu.offsetWidth <= viewportHeight;
    };

    ContextMenu.prototype.positionMenuBelowCursor = function (cursor, menu) {

      menu.style.top = cursor.top + 'px';
    };

    ContextMenu.prototype.positionMenuAboveCursor = function (cursor, menu, subMenu) {
      if (subMenu) {
        menu.style.top = (cursor.top + cursor.cellHeight - menu.offsetHeight) + 'px';
      } else {
        menu.style.top = (cursor.top - menu.offsetHeight) + 'px';
      }
    };

    ContextMenu.prototype.positionMenuOnRightOfCursor = function (cursor, menu, subMenu) {
      if (subMenu) {
        menu.style.left = 1 + cursor.left + cursor.cellWidth + 'px';
      } else {
        menu.style.left = 1 + cursor.left + 'px';
      }
    };

    ContextMenu.prototype.positionMenuOnLeftOfCursor = function (cursor, menu, subMenu) {
      if (subMenu) {
        menu.style.left = (cursor.left - menu.offsetWidth) + 'px';
      } else {
        menu.style.left = (cursor.left - menu.offsetWidth) + 'px';
      }
    };

    ContextMenu.utils = {};

    ContextMenu.utils.normalizeSelection = function (selRange) {
      return {
        start: selRange.getTopLeftCorner(),
        end: selRange.getBottomRightCorner()
      };
    };

    ContextMenu.utils.isSeparator = function (cell) {
      return Handsontable.Dom.hasClass(cell, 'htSeparator');
    };

    ContextMenu.utils.hasSubMenu = function (cell) {
      return Handsontable.Dom.hasClass(cell, 'htSubmenu');
    };

    ContextMenu.utils.isDisabled = function (cell) {
      return Handsontable.Dom.hasClass(cell, 'htDisabled');
    };

    ContextMenu.prototype.enable = function () {
      if (!this.enabled) {
        this.enabled = true;
        this.bindMouseEvents();
      }
    };

    ContextMenu.prototype.disable = function () {
      if (this.enabled) {
        this.enabled = false;
        this.closeAll();
        this.unbindMouseEvents();
        this.unbindTableEvents();
      }
    };

    ContextMenu.prototype.destroy = function () {
      this.closeAll();
      while (this.menus.length > 0) {
        var menu = this.menus.pop();
        this.triggerRows.pop();
        if (menu) {
          this.close(menu);
          if (!this.isMenuEnabledByOtherHotInstance()) {
            this.removeMenu(menu);
          }
        }
      }

      this.unbindMouseEvents();
      this.unbindTableEvents();

    };

    ContextMenu.prototype.isMenuEnabledByOtherHotInstance = function () {
      var hotContainers = document.querySelectorAll('.handsontable');
      var menuEnabled = false;

      for (var i = 0, len = hotContainers.length; i < len; i++) {
        var instance = this.htMenus[hotContainers[i].id];
        if (instance && instance.getSettings().contextMenu) {
          menuEnabled = true;
          break;
        }
      }

      return menuEnabled;
    };

    ContextMenu.prototype.removeMenu = function (menu) {
      if (menu.parentNode) {
        this.menu.parentNode.removeChild(menu);
      }
    };

    ContextMenu.prototype.align = function(range, type, alignment) {
      align.call(this, range, type, alignment);
    };

    ContextMenu.SEPARATOR = {name: "---------"};

    function updateHeight() {
      /* jshint ignore:start */
      if (this.rootElement.className.indexOf('htContextMenu')) {
        return;
      }

      var realSeparatorHeight = 0,
          realEntrySize = 0,
          dataSize = this.getSettings().data.length,
          currentHiderWidth = parseInt(this.view.wt.wtTable.hider.style.width,10);

      for (var i = 0; i < dataSize; i++) {
        if (this.getSettings().data[i].name == ContextMenu.SEPARATOR.name) {
          realSeparatorHeight += 1;
        } else {
          realEntrySize += 26;
        }
      }

      this.view.wt.wtTable.holder.style.width = currentHiderWidth + 22 + "px";
      this.view.wt.wtTable.holder.style.height = realEntrySize + realSeparatorHeight + 4 + "px";

      /* jshint ignore:end */
    }

    function init() {
      /* jshint ignore:start */
      var instance = this;
      /* jshint ignore:end */
      var contextMenuSetting = instance.getSettings().contextMenu;
      var customOptions = Handsontable.helper.isObject(contextMenuSetting) ? contextMenuSetting : {};

      if (contextMenuSetting) {
        if (!instance.contextMenu) {
          instance.contextMenu = new ContextMenu(instance, customOptions);
        }
        instance.contextMenu.enable();
      } else if (instance.contextMenu) {
        instance.contextMenu.destroy();
        delete instance.contextMenu;
      }
    }


    Handsontable.hooks.add('afterInit', init);
    Handsontable.hooks.add('afterUpdateSettings', init);
    Handsontable.hooks.add('afterInit', updateHeight);

    Handsontable.PluginHooks.register('afterContextMenuDefaultOptions');

    Handsontable.ContextMenu = ContextMenu;

  })(Handsontable);

  function Comments(instance) {

    var eventManager = Handsontable.eventManager(instance),
        doSaveComment = function (row, col, comment, instance) {
          instance.setCellMeta(row, col, 'comment', comment);
          instance.render();
        },
        saveComment = function (range, comment, instance) {
          //LIKE IN EXCEL (TOP LEFT CELL)
          doSaveComment(range.from.row, range.from.col, comment, instance);
        },
        hideCommentTextArea = function () {
          var commentBox = createCommentBox();
          commentBox.style.display = 'none';
          commentBox.value = '';
        },
        bindMouseEvent = function (range) {

          function commentsListener(event) {
            eventManager.removeEventListener(document, 'mouseover');
            if (!(event.target.className == 'htCommentTextArea' || event.target.innerHTML.indexOf('Comment') != -1)) {
              var value = document.querySelector('.htCommentTextArea').value;
              if (value.trim().length > 1) {
                saveComment(range, value, instance);
              }
              unBindMouseEvent();
              hideCommentTextArea();
            }
          }

          eventManager.addEventListener(document, 'mousedown',Handsontable.helper.proxy(commentsListener));
        },
        unBindMouseEvent = function () {
          eventManager.removeEventListener(document, 'mousedown');
          eventManager.addEventListener(document, 'mousedown', Handsontable.helper.proxy(commentsMouseOverListener));
        },
        placeCommentBox = function (range, commentBox) {
          var TD = instance.view.wt.wtTable.getCell(range.from),
              offset = Handsontable.Dom.offset(TD),
              lastColWidth = instance.getColWidth(range.from.col);

          commentBox.style.position = 'absolute';
          commentBox.style.left = offset.left + lastColWidth + 'px';
          commentBox.style.top = offset.top + 'px';
          commentBox.style.zIndex = 2;
          bindMouseEvent(range, commentBox);
        },
        createCommentBox = function (value) {
          var comments = document.querySelector('.htComments');

          if (!comments) {
            comments = document.createElement('DIV');

            var textArea = document.createElement('TEXTAREA');
            Handsontable.Dom.addClass(textArea, 'htCommentTextArea');
            comments.appendChild(textArea);

            Handsontable.Dom.addClass(comments, 'htComments');
            document.getElementsByTagName('body')[0].appendChild(comments);
          }

          value = value ||'';

          document.querySelector('.htCommentTextArea').value = value;

          //var tA = document.getElementsByClassName('htCommentTextArea')[0];
          //tA.focus();
          return comments;
        },
        commentsMouseOverListener = function (event) {
          if(event.target.className.indexOf('htCommentCell') != -1) {
            unBindMouseEvent();
            var coords = instance.view.wt.wtTable.getCoords(event.target);
            var range = {
              from: new WalkontableCellCoords(coords.row, coords.col)
            };

            Handsontable.Comments.showComment(range);
          }
          else if(event.target.className !='htCommentTextArea'){
            hideCommentTextArea();
          }
        };

    return {
      init: function () {
        eventManager.addEventListener(document, 'mouseover', Handsontable.helper.proxy(commentsMouseOverListener));
      },
      showComment: function (range) {
        var meta = instance.getCellMeta(range.from.row, range.from.col),
            value = '';

        if (meta.comment) {
          value = meta.comment;
        }
        var commentBox = createCommentBox(value);
        commentBox.style.display = 'block';
        placeCommentBox(range, commentBox);
      },
      removeComment: function (row, col) {
        instance.removeCellMeta(row, col, 'comment');
        instance.render();
      },
      checkSelectionCommentsConsistency : function () {
        var hasComment = false;
        // IN EXCEL THERE IS COMMENT ONLY FOR TOP LEFT CELL IN SELECTION
        var cell = instance.getSelectedRange().from;

        if(instance.getCellMeta(cell.row,cell.col).comment) {
          hasComment = true;
        }
        return hasComment;
      }


    };
  }


  var init = function () {
        var instance = this;
        var commentsSetting = instance.getSettings().comments;

        if (commentsSetting) {
          Handsontable.Comments = new Comments(instance);
          Handsontable.Comments.init();
        }
      },
      afterRenderer = function (TD, row, col, prop, value, cellProperties) {
        if(cellProperties.comment) {
          Handsontable.Dom.addClass(TD, cellProperties.commentedCellClassName);
        }
      },
      addCommentsActionsToContextMenu = function (defaultOptions) {
        var instance = this;
        if (!instance.getSettings().comments) {
          return;
        }

        defaultOptions.items.push(Handsontable.ContextMenu.SEPARATOR);

        defaultOptions.items.push({
          key: 'commentsAddEdit',
          name: function () {
            var hasComment = Handsontable.Comments.checkSelectionCommentsConsistency();
            return hasComment ? "Edit Comment" : "Add Comment";

          },
          callback: function (key, selection, event) {
            Handsontable.Comments.showComment(this.getSelectedRange());
          },
          disabled: function () {
            return false;
          }
        });

        defaultOptions.items.push({
          key: 'commentsRemove',
          name: function () {
            return "Delete Comment";
          },
          callback: function (key, selection, event) {
            Handsontable.Comments.removeComment(selection.start.row, selection.start.col);
          },
          disabled: function () {
            var hasComment = Handsontable.Comments.checkSelectionCommentsConsistency();
            return !hasComment;
          }
        });
      };

  Handsontable.hooks.add('beforeInit', init);
  Handsontable.hooks.add('afterContextMenuDefaultOptions', addCommentsActionsToContextMenu);
  Handsontable.hooks.add('afterRenderer', afterRenderer);


  /**
   * HandsontableManualColumnMove
   *
   * Has 2 UI components:
   * - handle - the draggable element that sets the desired position of the column
   * - guide - the helper guide that shows the desired position as a vertical guide
   *
   * Warning! Whenever you make a change in this file, make an analogous change in manualRowMove.js
   * @constructor
   */
  (function (Handsontable) {
    function HandsontableManualColumnMove() {
      var startCol
          , endCol
          , startX
          , startOffset
          , currentCol
          , instance
          , currentTH
          , handle = document.createElement('DIV')
          , guide = document.createElement('DIV')
          , eventManager = Handsontable.eventManager(this);

      handle.className = 'manualColumnMover';
      guide.className = 'manualColumnMoverGuide';

      var saveManualColumnPositions = function () {
        var instance = this;
        Handsontable.hooks.run(instance, 'persistentStateSave', 'manualColumnPositions', instance.manualColumnPositions);
      };

      var loadManualColumnPositions = function () {
        var instance = this;
        var storedState = {};
        Handsontable.hooks.run(instance, 'persistentStateLoad', 'manualColumnPositions', storedState);
        return storedState.value;
      };

      function setupHandlePosition(TH) {
        instance = this;
        currentTH = TH;

        var col = this.view.wt.wtTable.getCoords(TH).col; //getCoords returns WalkontableCellCoords
        if (col >= 0) { //if not row header
          currentCol = col;
          var box = currentTH.getBoundingClientRect();
          startOffset = box.left;
          handle.style.top = box.top + 'px';
          handle.style.left = startOffset + 'px';
          instance.rootElement.appendChild(handle);
        }
      }

      function refreshHandlePosition(TH, delta) {
        var box = TH.getBoundingClientRect();
        var handleWidth = 6;
        if (delta > 0) {
          handle.style.left = (box.left + box.width - handleWidth) + 'px';
        }
        else {
          handle.style.left = box.left + 'px';
        }
      }

      function setupGuidePosition() {
        var instance = this;
        Handsontable.Dom.addClass(handle, 'active');
        Handsontable.Dom.addClass(guide, 'active');
        var box = currentTH.getBoundingClientRect();
        guide.style.width = box.width + 'px';
        guide.style.height = instance.view.maximumVisibleElementHeight(0) + 'px';
        guide.style.top = handle.style.top;
        guide.style.left = startOffset + 'px';
        instance.rootElement.appendChild(guide);
      }

      function refreshGuidePosition(diff) {
        guide.style.left = startOffset + diff + 'px';
      }

      function hideHandleAndGuide() {
        Handsontable.Dom.removeClass(handle, 'active');
        Handsontable.Dom.removeClass(guide, 'active');
      }

      var checkColumnHeader = function (element) {
        if (element.tagName != 'BODY') {
          if (element.parentNode.tagName == 'THEAD') {
            return true;
          } else {
            element = element.parentNode;
            return checkColumnHeader(element);
          }
        }
        return false;
      };

      var getTHFromTargetElement = function (element) {
        if (element.tagName != 'TABLE') {
          if (element.tagName == 'TH') {
            return element;
          } else {
            return getTHFromTargetElement(element.parentNode);
          }
        }
        return null;
      };

      var bindEvents = function () {

        var instance = this;
        var pressed;

        eventManager.addEventListener(instance.rootElement,'mouseover',function (e) {
          if (checkColumnHeader(e.target)){
            var th = getTHFromTargetElement(e.target);
            if (th) {
              if (pressed) {
                var col = instance.view.wt.wtTable.getCoords(th).col;
                if(col >= 0) { //not TH above row header
                  endCol = col;
                  refreshHandlePosition(e.target, endCol - startCol);
                }
              }
              else {
                setupHandlePosition.call(instance, th);
              }
            }
          }
        });

        eventManager.addEventListener(instance.rootElement,'mousedown', function (e) {
          if (Handsontable.Dom.hasClass(e.target, 'manualColumnMover')){
            startX = Handsontable.helper.pageX(e);
            setupGuidePosition.call(instance);
            pressed = instance;

            startCol = currentCol;
            endCol = currentCol;
          }
        });

        eventManager.addEventListener(window,'mousemove',function (e) {
          if (pressed) {
            refreshGuidePosition(Handsontable.helper.pageX(e) - startX);
          }
        });


        eventManager.addEventListener(window,'mouseup',function (e) {
          if (pressed) {
            hideHandleAndGuide();
            pressed = false;

            createPositionData(instance.manualColumnPositions, instance.countCols());
            instance.manualColumnPositions.splice(endCol, 0, instance.manualColumnPositions.splice(startCol, 1)[0]);

            instance.forceFullRender = true;
            instance.view.render(); //updates all

            saveManualColumnPositions.call(instance);

            Handsontable.hooks.run(instance, 'afterColumnMove', startCol, endCol);

            setupHandlePosition.call(instance, currentTH);
          }
        });

        instance.addHook('afterDestroy', unbindEvents);
      };

      var unbindEvents = function(){
        eventManager.clear();
      };

      var createPositionData = function (positionArr, len) {
        if (positionArr.length < len) {
          for (var i = positionArr.length; i < len; i++) {
            positionArr[i] = i;
          }
        }
      };

      this.beforeInit = function () {
        this.manualColumnPositions = [];
      };

      this.init = function (source) {
        var instance = this;

        var manualColMoveEnabled = !!(this.getSettings().manualColumnMove);

        if (manualColMoveEnabled) {
          var initialManualColumnPositions = this.getSettings().manualColumnMove;

          var loadedManualColumnPositions = loadManualColumnPositions.call(instance);

          if (typeof loadedManualColumnPositions != 'undefined') {
            this.manualColumnPositions = loadedManualColumnPositions;
          } else if (Array.isArray(initialManualColumnPositions)) {
            this.manualColumnPositions = initialManualColumnPositions;
          } else {
            this.manualColumnPositions = [];
          }

          if (source == 'afterInit') {

            // update plugin usages count for manualColumnPositions
            if (typeof instance.manualColumnPositionsPluginUsages != 'undefined') {
              instance.manualColumnPositionsPluginUsages.push('manualColumnMove');
            } else {
              instance.manualColumnPositionsPluginUsages = ['manualColumnMove'];
            }

            bindEvents.call(this);
            if (this.manualColumnPositions.length > 0) {
              this.forceFullRender = true;
              this.render();
            }
          }

        } else {
          var pluginUsagesIndex = instance.manualColumnPositionsPluginUsages ? instance.manualColumnPositionsPluginUsages.indexOf('manualColumnMove') : -1;
          if (pluginUsagesIndex > -1) {
            unbindEvents.call(this);
            this.manualColumnPositions = [];
            instance.manualColumnPositionsPluginUsages[pluginUsagesIndex] = void 0;
          }
        }
      };

      this.modifyCol = function (col) {
        //TODO test performance: http://jsperf.com/object-wrapper-vs-primitive/2
        if (this.getSettings().manualColumnMove) {
          if (typeof this.manualColumnPositions[col] === 'undefined') {
            createPositionData(this.manualColumnPositions, col + 1);
          }
          return this.manualColumnPositions[col];
        }
        return col;
      };

      // need to reconstruct manualcolpositions after removing columns
      this.afterRemoveCol = function (index, amount) {
        if (!this.getSettings().manualColumnMove) {
          return;
        }

        var rmindx,
            colpos = this.manualColumnPositions;

        // We have removed columns, we also need to remove the indicies from manual column array
        rmindx = colpos.splice(index, amount);

        // We need to remap manualColPositions so it remains constant linear from 0->ncols
        colpos = colpos.map(function (colpos) {
          var i, newpos = colpos;

          for (i = 0; i < rmindx.length; i++) {
            if (colpos > rmindx[i]) {
              newpos--;
            }
          }

          return newpos;
        });

        this.manualColumnPositions = colpos;
      };

      // need to reconstruct manualcolpositions after adding columns
      this.afterCreateCol = function (index, amount) {
        if (!this.getSettings().manualColumnMove) {
          return;
        }

        var colpos = this.manualColumnPositions;
        if (!colpos.length) {
          return;
        }

        var addindx = [];
        for (var i = 0; i < amount; i++) {
          addindx.push(index + i);
        }

        if (index >= colpos.length) {
          colpos.concat(addindx);
        }
        else {
          // We need to remap manualColPositions so it remains constant linear from 0->ncols
          colpos = colpos.map(function (colpos) {
            return (colpos >= index) ? (colpos + amount) : colpos;
          });

          // We have added columns, we also need to add new indicies to manualcolumn position array
          colpos.splice.apply(colpos, [index, 0].concat(addindx));
        }

        this.manualColumnPositions = colpos;
      };
    }
    var htManualColumnMove = new HandsontableManualColumnMove();

    Handsontable.hooks.add('beforeInit', htManualColumnMove.beforeInit);
    Handsontable.hooks.add('afterInit', function () {
      htManualColumnMove.init.call(this, 'afterInit');
    });

    Handsontable.hooks.add('afterUpdateSettings', function () {
      htManualColumnMove.init.call(this, 'afterUpdateSettings');
    });
    Handsontable.hooks.add('modifyCol', htManualColumnMove.modifyCol);

    Handsontable.hooks.add('afterRemoveCol', htManualColumnMove.afterRemoveCol);
    Handsontable.hooks.add('afterCreateCol', htManualColumnMove.afterCreateCol);
    Handsontable.hooks.register('afterColumnMove');

  })(Handsontable);



  /**
   * HandsontableManualColumnResize
   *
   * Has 2 UI components:
   * - handle - the draggable element that sets the desired width of the column
   * - guide - the helper guide that shows the desired width as a vertical guide
   *
   * Warning! Whenever you make a change in this file, make an analogous change in manualRowResize.js
   * @constructor
   */
  (function (Handsontable) {
    function HandsontableManualColumnResize() {
      var currentTH
          , currentCol
          , currentWidth
          , instance
          , newSize
          , startX
          , startWidth
          , startOffset
          , handle = document.createElement('DIV')
          , guide = document.createElement('DIV')
          , eventManager = Handsontable.eventManager(this);


      handle.className = 'manualColumnResizer';
      guide.className = 'manualColumnResizerGuide';

      var saveManualColumnWidths = function () {
        var instance = this;
        Handsontable.hooks.run(instance, 'persistentStateSave', 'manualColumnWidths', instance.manualColumnWidths);
      };

      var loadManualColumnWidths = function () {
        var instance = this;
        var storedState = {};
        Handsontable.hooks.run(instance, 'persistentStateLoad', 'manualColumnWidths', storedState);
        return storedState.value;
      };

      function setupHandlePosition(TH) {
        instance = this;
        currentTH = TH;

        var col = this.view.wt.wtTable.getCoords(TH).col; //getCoords returns WalkontableCellCoords
        if (col >= 0) { //if not row header
          currentCol = col;
          var box = currentTH.getBoundingClientRect();
          startOffset = box.left - 6;
          startWidth = parseInt(box.width, 10);
          handle.style.top = box.top + 'px';
          handle.style.left = startOffset + startWidth + 'px';
          instance.rootElement.appendChild(handle);
        }
      }

      function refreshHandlePosition() {
        handle.style.left = startOffset + currentWidth + 'px';
      }

      function setupGuidePosition() {
        var instance = this;
        Handsontable.Dom.addClass(handle, 'active');
        Handsontable.Dom.addClass(guide, 'active');
        guide.style.top = handle.style.top;
        guide.style.left = handle.style.left;
        guide.style.height = instance.view.maximumVisibleElementHeight(0) + 'px';
        instance.rootElement.appendChild(guide);
      }

      function refreshGuidePosition() {
        guide.style.left = handle.style.left;
      }

      function hideHandleAndGuide() {
        Handsontable.Dom.removeClass(handle, 'active');
        Handsontable.Dom.removeClass(guide, 'active');
      }

      var checkColumnHeader = function (element) {
        if (element.tagName != 'BODY') {
          if (element.parentNode.tagName == 'THEAD') {
            return true;
          } else {
            element = element.parentNode;
            return checkColumnHeader(element);
          }
        }
        return false;
      };

      var getTHFromTargetElement = function (element) {
        if (element.tagName != 'TABLE') {
          if (element.tagName == 'TH') {
            return element;
          } else {
            return getTHFromTargetElement(element.parentNode);
          }
        }
        return null;
      };

      var bindEvents = function () {
        var instance = this;
        var pressed;
        var dblclick = 0;
        var autoresizeTimeout = null;

        eventManager.addEventListener(instance.rootElement, 'mouseover', function (e) {
          if (checkColumnHeader(e.target)) {
            var th = getTHFromTargetElement(e.target);
            if (th) {
              if (!pressed) {
                setupHandlePosition.call(instance, th);
              }
            }
          }
        });

        eventManager.addEventListener(instance.rootElement, 'mousedown', function (e) {
          if (Handsontable.Dom.hasClass(e.target, 'manualColumnResizer')) {
            setupGuidePosition.call(instance);
            pressed = instance;

            if (autoresizeTimeout == null) {
              autoresizeTimeout = setTimeout(function () {
                if (dblclick >= 2) {
                  newSize = instance.determineColumnWidth.call(instance, currentCol);
                  setManualSize(currentCol, newSize);
                  instance.forceFullRender = true;
                  instance.view.render(); //updates all
                  Handsontable.hooks.run(instance, 'afterColumnResize', currentCol, newSize);
                }
                dblclick = 0;
                autoresizeTimeout = null;
              }, 500);
              instance._registerTimeout(autoresizeTimeout);
            }
            dblclick++;

            startX = Handsontable.helper.pageX(e);
            newSize = startWidth;
          }
        });

        eventManager.addEventListener(window, 'mousemove', function (e) {
          if (pressed) {
            currentWidth = startWidth + (Handsontable.helper.pageX(e) - startX);
            newSize = setManualSize(currentCol, currentWidth); //save col width
            refreshHandlePosition();
            refreshGuidePosition();
          }
        });

        eventManager.addEventListener(window, 'mouseup', function () {
          if (pressed) {
            hideHandleAndGuide();
            pressed = false;

            if (newSize != startWidth) {
              instance.forceFullRender = true;
              instance.view.render(); //updates all

              saveManualColumnWidths.call(instance);

              Handsontable.hooks.run(instance, 'afterColumnResize', currentCol, newSize);
            }

            setupHandlePosition.call(instance, currentTH);
          }
        });

        instance.addHook('afterDestroy', unbindEvents);
      };

      var unbindEvents = function () {
        eventManager.clear();
      };

      this.beforeInit = function () {
        this.manualColumnWidths = [];
      };

      this.init = function (source) {
        var instance = this;
        var manualColumnWidthEnabled = !!(this.getSettings().manualColumnResize);

        if (manualColumnWidthEnabled) {
          var initialColumnWidths = this.getSettings().manualColumnResize;
          var loadedManualColumnWidths = loadManualColumnWidths.call(instance);

          // update plugin usages count for manualColumnPositions
          if (typeof instance.manualColumnWidthsPluginUsages != 'undefined') {
            instance.manualColumnWidthsPluginUsages.push('manualColumnResize');
          } else {
            instance.manualColumnWidthsPluginUsages = ['manualColumnResize'];
          }

          if (typeof loadedManualColumnWidths != 'undefined') {
            this.manualColumnWidths = loadedManualColumnWidths;
          } else if (Array.isArray(initialColumnWidths)) {
            this.manualColumnWidths = initialColumnWidths;
          } else {
            this.manualColumnWidths = [];
          }

          if (source == 'afterInit') {
            bindEvents.call(this);
            if (this.manualColumnWidths.length > 0) {
              this.forceFullRender = true;
              this.render();
            }
          }
        }
        else {
          var pluginUsagesIndex = instance.manualColumnWidthsPluginUsages ? instance.manualColumnWidthsPluginUsages.indexOf('manualColumnResize') : -1;
          if (pluginUsagesIndex > -1) {
            unbindEvents.call(this);
            this.manualColumnWidths = [];
          }
        }
      };


      var setManualSize = function (col, width) {
        width = Math.max(width, 20);

        /**
         *  We need to run col through modifyCol hook, in case the order of displayed columns is different than the order
         *  in data source. For instance, this order can be modified by manualColumnMove plugin.
         */
        col = Handsontable.hooks.run(instance, 'modifyCol', col);
        instance.manualColumnWidths[col] = width;

        return width;
      };

      this.modifyColWidth = function (width, col) {
        col = this.runHooks('modifyCol', col);

        if (this.getSettings().manualColumnResize && this.manualColumnWidths[col]) {
          return this.manualColumnWidths[col];
        }

        return width;
      };
    }

    var htManualColumnResize = new HandsontableManualColumnResize();

    Handsontable.hooks.add('beforeInit', htManualColumnResize.beforeInit);
    Handsontable.hooks.add('afterInit', function () {
      htManualColumnResize.init.call(this, 'afterInit');
    });
    Handsontable.hooks.add('afterUpdateSettings', function () {
      htManualColumnResize.init.call(this, 'afterUpdateSettings');
    });
    Handsontable.hooks.add('modifyColWidth', htManualColumnResize.modifyColWidth);

    Handsontable.hooks.register('afterColumnResize');

  })(Handsontable);

  /**
   * HandsontableManualRowResize
   *
   * Has 2 UI components:
   * - handle - the draggable element that sets the desired height of the row
   * - guide - the helper guide that shows the desired height as a horizontal guide
   *
   * Warning! Whenever you make a change in this file, make an analogous change in manualRowResize.js
   * @constructor
   */
  (function (Handsontable) {
    function HandsontableManualRowResize() {

      var currentTH
          , currentRow
          , currentHeight
          , instance
          , newSize
          , startY
          , startHeight
          , startOffset
          , handle = document.createElement('DIV')
          , guide = document.createElement('DIV')
          , eventManager = Handsontable.eventManager(this);

      handle.className = 'manualRowResizer';
      guide.className = 'manualRowResizerGuide';

      var saveManualRowHeights = function () {
        var instance = this;
        Handsontable.hooks.run(instance, 'persistentStateSave', 'manualRowHeights', instance.manualRowHeights);
      };

      var loadManualRowHeights = function () {
        var instance = this
            , storedState = {};
        Handsontable.hooks.run(instance, 'persistentStateLoad', 'manualRowHeights', storedState);
        return storedState.value;
      };

      function setupHandlePosition(TH) {
        instance = this;
        currentTH = TH;

        var row = this.view.wt.wtTable.getCoords(TH).row; //getCoords returns WalkontableCellCoords
        if (row >= 0) { //if not col header
          currentRow = row;
          var box = currentTH.getBoundingClientRect();
          startOffset = box.top - 6;
          startHeight = parseInt(box.height, 10);
          handle.style.left = box.left + 'px';
          handle.style.top = startOffset + startHeight + 'px';
          instance.rootElement.appendChild(handle);
        }
      }

      function refreshHandlePosition() {
        handle.style.top = startOffset + currentHeight + 'px';
      }

      function setupGuidePosition() {
        var instance = this;
        Handsontable.Dom.addClass(handle, 'active');
        Handsontable.Dom.addClass(guide, 'active');
        guide.style.top = handle.style.top;
        guide.style.left = handle.style.left;
        guide.style.width = instance.view.maximumVisibleElementWidth(0) + 'px';
        instance.rootElement.appendChild(guide);
      }

      function refreshGuidePosition() {
        guide.style.top = handle.style.top;
      }

      function hideHandleAndGuide() {
        Handsontable.Dom.removeClass(handle, 'active');
        Handsontable.Dom.removeClass(guide, 'active');
      }

      var checkRowHeader = function (element) {
        if (element.tagName != 'BODY') {
          if (element.parentNode.tagName == 'TBODY') {
            return true;
          } else {
            element = element.parentNode;
            return checkRowHeader(element);
          }
        }
        return false;
      };

      var getTHFromTargetElement = function (element) {
        if (element.tagName != 'TABLE') {
          if (element.tagName == 'TH') {
            return element;
          } else {
            return getTHFromTargetElement(element.parentNode);
          }
        }
        return null;
      };

      var bindEvents = function () {
        var instance = this;
        var pressed;
        var dblclick = 0;
        var autoresizeTimeout = null;

        eventManager.addEventListener(instance.rootElement, 'mouseover', function (e) {
          if (checkRowHeader(e.target)) {
            var th = getTHFromTargetElement(e.target);
            if (th) {
              if (!pressed) {
                setupHandlePosition.call(instance, th);
              }
            }
          }
        });

        eventManager.addEventListener(instance.rootElement, 'mousedown', function (e) {
          if (Handsontable.Dom.hasClass(e.target, 'manualRowResizer')) {
            setupGuidePosition.call(instance);
            pressed = instance;

            if (autoresizeTimeout == null) {
              autoresizeTimeout = setTimeout(function () {
                if (dblclick >= 2) {
                  setManualSize(currentRow, null); //double click sets auto row size
                  instance.forceFullRender = true;
                  instance.view.render(); //updates all
                  Handsontable.hooks.run(instance, 'afterRowResize', currentRow, newSize);
                }
                dblclick = 0;
                autoresizeTimeout = null;
              }, 500);
              instance._registerTimeout(autoresizeTimeout);
            }
            dblclick++;

            startY = Handsontable.helper.pageY(e);
            newSize = startHeight;
          }
        });

        eventManager.addEventListener(window, 'mousemove', function (e) {
          if (pressed) {
            currentHeight = startHeight + (Handsontable.helper.pageY(e) - startY);
            newSize = setManualSize(currentRow, currentHeight);
            refreshHandlePosition();
            refreshGuidePosition();
          }
        });

        eventManager.addEventListener(window, 'mouseup', function (e) {
          if (pressed) {
            hideHandleAndGuide();
            pressed = false;

            if (newSize != startHeight) {
              instance.forceFullRender = true;
              instance.view.render(); //updates all

              saveManualRowHeights.call(instance);

              Handsontable.hooks.run(instance, 'afterRowResize', currentRow, newSize);
            }

            setupHandlePosition.call(instance, currentTH);
          }
        });

        instance.addHook('afterDestroy', unbindEvents);
      };

      var unbindEvents = function () {
        eventManager.clear();
      };

      this.beforeInit = function () {
        this.manualRowHeights = [];
      };

      this.init = function (source) {
        var instance = this;
        var manualColumnHeightEnabled = !!(this.getSettings().manualRowResize);

        if (manualColumnHeightEnabled) {

          var initialRowHeights = this.getSettings().manualRowResize;
          var loadedManualRowHeights = loadManualRowHeights.call(instance);

          // update plugin usages count for manualColumnPositions
          if (typeof instance.manualRowHeightsPluginUsages != 'undefined') {
            instance.manualRowHeightsPluginUsages.push('manualRowResize');
          } else {
            instance.manualRowHeightsPluginUsages = ['manualRowResize'];
          }

          if (typeof loadedManualRowHeights != 'undefined') {
            this.manualRowHeights = loadedManualRowHeights;
          } else if (Array.isArray(initialRowHeights)) {
            this.manualRowHeights = initialRowHeights;
          } else {
            this.manualRowHeights = [];
          }

          if (source === 'afterInit') {
            bindEvents.call(this);
            if (this.manualRowHeights.length > 0) {
              this.forceFullRender = true;
              this.render();
            }
          }
          else {
            this.forceFullRender = true;
            this.render();

          }
        }
        else {
          var pluginUsagesIndex = instance.manualRowHeightsPluginUsages ? instance.manualRowHeightsPluginUsages.indexOf('manualRowResize') : -1;
          if (pluginUsagesIndex > -1) {
            unbindEvents.call(this);
            this.manualRowHeights = [];
            instance.manualRowHeightsPluginUsages[pluginUsagesIndex] = void 0;
          }
        }
      };

      var setManualSize = function (row, height) {
        row = Handsontable.hooks.run(instance, 'modifyRow', row);
        instance.manualRowHeights[row] = height;

        return height;
      };

      this.modifyRowHeight = function (height, row) {
        if (this.getSettings().manualRowResize) {
          row = this.runHooks('modifyRow', row);

          if (this.manualRowHeights[row] !== void 0) {
            return this.manualRowHeights[row];
          }
        }

        return height;
      };
    }

    var htManualRowResize = new HandsontableManualRowResize();

    Handsontable.hooks.add('beforeInit', htManualRowResize.beforeInit);
    Handsontable.hooks.add('afterInit', function () {
      htManualRowResize.init.call(this, 'afterInit');
    });

    Handsontable.hooks.add('afterUpdateSettings', function () {
      htManualRowResize.init.call(this, 'afterUpdateSettings');
    });

    Handsontable.hooks.add('modifyRowHeight', htManualRowResize.modifyRowHeight);

    Handsontable.hooks.register('afterRowResize');

  })(Handsontable);

  (function HandsontableObserveChanges() {

    Handsontable.hooks.add('afterLoadData', init);
    Handsontable.hooks.add('afterUpdateSettings', init);

    Handsontable.hooks.register('afterChangesObserved');

    function init() {
      var instance = this;
      var pluginEnabled = instance.getSettings().observeChanges;

      if (pluginEnabled) {
        if(instance.observer) {
          destroy.call(instance); //destroy observer for old data object
        }
        createObserver.call(instance);
        bindEvents.call(instance);

      } else if (!pluginEnabled){
        destroy.call(instance);
      }
    }

    function createObserver(){
      var instance = this;

      instance.observeChangesActive = true;

      instance.pauseObservingChanges = function(){
        instance.observeChangesActive = false;
      };

      instance.resumeObservingChanges = function(){
        instance.observeChangesActive = true;
      };

      instance.observedData = instance.getData();
      instance.observer = jsonpatch.observe(instance.observedData, function (patches) {
        if(instance.observeChangesActive){
          runHookForOperation.call(instance, patches);
          instance.render();
        }

        instance.runHooks('afterChangesObserved');
      });
    }

    function runHookForOperation(rawPatches){
      var instance = this;
      var patches = cleanPatches(rawPatches);

      for(var i = 0, len = patches.length; i < len; i++){
        var patch = patches[i];
        var parsedPath = parsePath(patch.path);


        switch(patch.op){
          case 'add':
            if(isNaN(parsedPath.col)){
              instance.runHooks('afterCreateRow', parsedPath.row);
            } else {
              instance.runHooks('afterCreateCol', parsedPath.col);
            }
            break;

          case 'remove':
            if(isNaN(parsedPath.col)){
              instance.runHooks('afterRemoveRow', parsedPath.row, 1);
            } else {
              instance.runHooks('afterRemoveCol', parsedPath.col, 1);
            }
            break;

          case 'replace':
            instance.runHooks('afterChange', [parsedPath.row, parsedPath.col, null, patch.value], 'external');
            break;
        }
      }

      function cleanPatches(rawPatches){
        var patches;

        patches = removeLengthRelatedPatches(rawPatches);
        patches = removeMultipleAddOrRemoveColPatches(patches);

        return patches;
      }

      /**
       * Removing or adding column will produce one patch for each table row.
       * This function leaves only one patch for each column add/remove operation
       */
      function removeMultipleAddOrRemoveColPatches(rawPatches){
        var newOrRemovedColumns = [];

        return rawPatches.filter(function(patch){
          var parsedPath = parsePath(patch.path);

          if(['add', 'remove'].indexOf(patch.op) != -1 && !isNaN(parsedPath.col)){
            if(newOrRemovedColumns.indexOf(parsedPath.col) != -1){
              return false;
            } else {
              newOrRemovedColumns.push(parsedPath.col);
            }
          }

          return true;
        });

      }

      /**
       * If observeChanges uses native Object.observe method, then it produces patches for length property.
       * This function removes them.
       */
      function removeLengthRelatedPatches(rawPatches){
        return rawPatches.filter(function(patch){
          return !/[/]length/ig.test(patch.path);
        });
      }

      function parsePath(path){
        var match = path.match(/^\/(\d+)\/?(.*)?$/);
        return {
          row: parseInt(match[1], 10),
          col: /^\d*$/.test(match[2]) ? parseInt(match[2], 10) : match[2]
        };
      }
    }

    function destroy(){
      var instance = this;

      if (instance.observer){
        destroyObserver.call(instance);
        unbindEvents.call(instance);
      }
    }

    function destroyObserver(){
      var instance = this;

      jsonpatch.unobserve(instance.observedData, instance.observer);
      delete instance.observeChangesActive;
      delete instance.pauseObservingChanges;
      delete instance.resumeObservingChanges;
    }

    function bindEvents(){
      var instance = this;
      instance.addHook('afterDestroy', destroy);

      instance.addHook('afterCreateRow', afterTableAlter);
      instance.addHook('afterRemoveRow', afterTableAlter);

      instance.addHook('afterCreateCol', afterTableAlter);
      instance.addHook('afterRemoveCol', afterTableAlter);

      instance.addHook('afterChange', function(changes, source){
        if(source != 'loadData'){
          afterTableAlter.call(this);
        }
      });
    }

    function unbindEvents(){
      var instance = this;
      instance.removeHook('afterDestroy', destroy);

      instance.removeHook('afterCreateRow', afterTableAlter);
      instance.removeHook('afterRemoveRow', afterTableAlter);

      instance.removeHook('afterCreateCol', afterTableAlter);
      instance.removeHook('afterRemoveCol', afterTableAlter);

      instance.removeHook('afterChange', afterTableAlter);
    }

    function afterTableAlter(){
      var instance = this;

      instance.pauseObservingChanges();

      instance.addHookOnce('afterChangesObserved', function(){
        instance.resumeObservingChanges();
      });

    }
  })();


  /*
   *
   * Plugin enables saving table state
   *
   * */


  function Storage(prefix) {

    var savedKeys;

    var saveSavedKeys = function () {
      window.localStorage[prefix + '__' + 'persistentStateKeys'] = JSON.stringify(savedKeys);
    };

    var loadSavedKeys = function () {
      var keysJSON = window.localStorage[prefix + '__' + 'persistentStateKeys'];
      var keys = typeof keysJSON == 'string' ? JSON.parse(keysJSON) : void 0;
      savedKeys = keys ? keys : [];
    };

    var clearSavedKeys = function () {
      savedKeys = [];
      saveSavedKeys();
    };

    loadSavedKeys();

    this.saveValue = function (key, value) {
      window.localStorage[prefix + '_' + key] = JSON.stringify(value);
      if (savedKeys.indexOf(key) == -1) {
        savedKeys.push(key);
        saveSavedKeys();
      }

    };

    this.loadValue = function (key, defaultValue) {

      key = typeof key != 'undefined' ? key : defaultValue;

      var value = window.localStorage[prefix + '_' + key];

      return typeof value == "undefined" ? void 0 : JSON.parse(value);

    };

    this.reset = function (key) {
      window.localStorage.removeItem(prefix + '_' + key);
    };

    this.resetAll = function () {
      for (var index = 0; index < savedKeys.length; index++) {
        window.localStorage.removeItem(prefix + '_' + savedKeys[index]);
      }

      clearSavedKeys();
    };

  }


  (function (StorageClass) {
    function HandsontablePersistentState() {
      var plugin = this;


      this.init = function () {
        var instance = this,
            pluginSettings = instance.getSettings()['persistentState'];

        plugin.enabled = !!(pluginSettings);

        if (!plugin.enabled) {
          removeHooks.call(instance);
          return;
        }

        if (!instance.storage) {
          instance.storage = new StorageClass(instance.rootElement.id);
        }

        instance.resetState = plugin.resetValue;

        addHooks.call(instance);

      };

      this.saveValue = function (key, value) {
        var instance = this;

        instance.storage.saveValue(key, value);
      };

      this.loadValue = function (key, saveTo) {
        var instance = this;

        saveTo.value = instance.storage.loadValue(key);
      };

      this.resetValue = function (key) {
        var instance = this;

        if (typeof  key != 'undefined') {
          instance.storage.reset(key);
        } else {
          instance.storage.resetAll();
        }

      };

      var hooks = {
        'persistentStateSave': plugin.saveValue,
        'persistentStateLoad': plugin.loadValue,
        'persistentStateReset': plugin.resetValue
      };

      for (var hookName in hooks) {
        if (hooks.hasOwnProperty(hookName)) {
          Handsontable.hooks.register(hookName);
        }
      }

      function addHooks() {
        var instance = this;

        for (var hookName in hooks) {
          if (hooks.hasOwnProperty(hookName)) {
            instance.addHook(hookName, hooks[hookName]);
          }
        }
      }

      function removeHooks() {
        var instance = this;

        for (var hookName in hooks) {
          if (hooks.hasOwnProperty(hookName)) {
            instance.removeHook(hookName, hooks[hookName]);
          }
        }
      }
    }

    var htPersistentState = new HandsontablePersistentState();
    Handsontable.hooks.add('beforeInit', htPersistentState.init);
    Handsontable.hooks.add('afterUpdateSettings', htPersistentState.init);
  })(Storage);

  /**
   * Handsontable UndoRedo plugin class
   *
   * @plugin
   * @class Handsontable.UndoRedo
   */
  (function(Handsontable){
    Handsontable.UndoRedo = function (instance) {
      var plugin = this;
      this.instance = instance;
      this.doneActions = [];
      this.undoneActions = [];
      this.ignoreNewActions = false;
      instance.addHook("afterChange", function (changes, origin) {
        if(changes){
          var action = new Handsontable.UndoRedo.ChangeAction(changes);
          plugin.done(action);
        }
      });

      instance.addHook("afterCreateRow", function (index, amount, createdAutomatically) {

        if (createdAutomatically) {
          return;
        }

        var action = new Handsontable.UndoRedo.CreateRowAction(index, amount);
        plugin.done(action);
      });

      instance.addHook("beforeRemoveRow", function (index, amount) {
        var originalData = plugin.instance.getData();
        index = ( originalData.length + index ) % originalData.length;
        var removedData = originalData.slice(index, index + amount);
        var action = new Handsontable.UndoRedo.RemoveRowAction(index, removedData);
        plugin.done(action);
      });

      instance.addHook("afterCreateCol", function (index, amount, createdAutomatically) {

        if (createdAutomatically) {
          return;
        }

        var action = new Handsontable.UndoRedo.CreateColumnAction(index, amount);
        plugin.done(action);
      });

      instance.addHook("beforeRemoveCol", function (index, amount) {
        var originalData = plugin.instance.getData();
        index = ( plugin.instance.countCols() + index ) % plugin.instance.countCols();
        var removedData = [];

        for (var i = 0, len = originalData.length; i < len; i++) {
          removedData[i] = originalData[i].slice(index, index + amount);
        }

        var headers;
        if(Array.isArray(instance.getSettings().colHeaders)){
          headers = instance.getSettings().colHeaders.slice(index, index + removedData.length);
        }

        var action = new Handsontable.UndoRedo.RemoveColumnAction(index, removedData, headers);
        plugin.done(action);
      });

      instance.addHook("beforeCellAlignment", function (stateBefore, range, type, alignment) {
        var action = new Handsontable.UndoRedo.CellAlignmentAction(stateBefore, range, type, alignment);
        plugin.done(action);
      });
    };

    Handsontable.UndoRedo.prototype.done = function (action) {
      if (!this.ignoreNewActions) {
        this.doneActions.push(action);
        this.undoneActions.length = 0;
      }
    };

    /**
     * Undo last edit.
     */
    Handsontable.UndoRedo.prototype.undo = function () {
      if (this.isUndoAvailable()) {
        var action = this.doneActions.pop();

        this.ignoreNewActions = true;
        var that = this;
        action.undo(this.instance, function () {
          that.ignoreNewActions = false;
          that.undoneActions.push(action);
        });



      }
    };

    /**
     * Redo edit (used to reverse an undo).
     */
    Handsontable.UndoRedo.prototype.redo = function () {
      if (this.isRedoAvailable()) {
        var action = this.undoneActions.pop();

        this.ignoreNewActions = true;
        var that = this;
        action.redo(this.instance, function () {
          that.ignoreNewActions = false;
          that.doneActions.push(action);
        });



      }
    };

    /**
     * Check if undo action is available.
     *
     * @return {Boolean} Return `true` if undo can be performed, `false` otherwise
     */
    Handsontable.UndoRedo.prototype.isUndoAvailable = function () {
      return this.doneActions.length > 0;
    };

    /**
     * Check if redo action is available.
     *
     * @return {Boolean} Return `true` if redo can be performed, `false` otherwise.
     */
    Handsontable.UndoRedo.prototype.isRedoAvailable = function () {
      return this.undoneActions.length > 0;
    };

    /**
     * Clears undo history.
     */
    Handsontable.UndoRedo.prototype.clear = function () {
      this.doneActions.length = 0;
      this.undoneActions.length = 0;
    };

    Handsontable.UndoRedo.Action = function () {
    };
    Handsontable.UndoRedo.Action.prototype.undo = function () {
    };
    Handsontable.UndoRedo.Action.prototype.redo = function () {
    };

    Handsontable.UndoRedo.ChangeAction = function (changes) {
      this.changes = changes;
    };
    Handsontable.helper.inherit(Handsontable.UndoRedo.ChangeAction, Handsontable.UndoRedo.Action);
    Handsontable.UndoRedo.ChangeAction.prototype.undo = function (instance, undoneCallback) {
      var data = Handsontable.helper.deepClone(this.changes),
          emptyRowsAtTheEnd = instance.countEmptyRows(true),
          emptyColsAtTheEnd = instance.countEmptyCols(true);

      for (var i = 0, len = data.length; i < len; i++) {
        data[i].splice(3, 1);
      }

      instance.addHookOnce('afterChange', undoneCallback);

      instance.setDataAtRowProp(data, null, null, 'undo');

      for (var i = 0, len = data.length; i < len; i++) {
        if (instance.getSettings().minSpareRows &&
            data[i][0] + 1 + instance.getSettings().minSpareRows === instance.countRows() &&
            emptyRowsAtTheEnd == instance.getSettings().minSpareRows) {

          instance.alter('remove_row', parseInt(data[i][0]+1,10), instance.getSettings().minSpareRows);
          instance.undoRedo.doneActions.pop();

        }

        if (instance.getSettings().minSpareCols &&
            data[i][1] + 1 + instance.getSettings().minSpareCols === instance.countCols() &&
            emptyColsAtTheEnd == instance.getSettings().minSpareCols) {

          instance.alter('remove_col', parseInt(data[i][1]+1,10), instance.getSettings().minSpareCols);
          instance.undoRedo.doneActions.pop();
        }
      }

    };
    Handsontable.UndoRedo.ChangeAction.prototype.redo = function (instance, onFinishCallback) {
      var data = Handsontable.helper.deepClone(this.changes);

      for (var i = 0, len = data.length; i < len; i++) {
        data[i].splice(2, 1);
      }

      instance.addHookOnce('afterChange', onFinishCallback);

      instance.setDataAtRowProp(data, null, null, 'redo');

    };

    Handsontable.UndoRedo.CreateRowAction = function (index, amount) {
      this.index = index;
      this.amount = amount;
    };
    Handsontable.helper.inherit(Handsontable.UndoRedo.CreateRowAction, Handsontable.UndoRedo.Action);
    Handsontable.UndoRedo.CreateRowAction.prototype.undo = function (instance, undoneCallback) {
      var rowCount = instance.countRows(),
          minSpareRows = instance.getSettings().minSpareRows;
      if(this.index >= rowCount && this.index - minSpareRows < rowCount) {
        this.index -= minSpareRows; // work around the situation where the needed row was removed due to an 'undo' of a made change
      }

      instance.addHookOnce('afterRemoveRow', undoneCallback);
      instance.alter('remove_row', this.index, this.amount);
    };
    Handsontable.UndoRedo.CreateRowAction.prototype.redo = function (instance, redoneCallback) {
      instance.addHookOnce('afterCreateRow', redoneCallback);
      instance.alter('insert_row', this.index + 1, this.amount);
    };

    Handsontable.UndoRedo.RemoveRowAction = function (index, data) {
      this.index = index;
      this.data = data;
    };
    Handsontable.helper.inherit(Handsontable.UndoRedo.RemoveRowAction, Handsontable.UndoRedo.Action);
    Handsontable.UndoRedo.RemoveRowAction.prototype.undo = function (instance, undoneCallback) {
      var spliceArgs = [this.index, 0];
      Array.prototype.push.apply(spliceArgs, this.data);

      Array.prototype.splice.apply(instance.getData(), spliceArgs);

      instance.addHookOnce('afterRender', undoneCallback);
      instance.render();
    };
    Handsontable.UndoRedo.RemoveRowAction.prototype.redo = function (instance, redoneCallback) {
      instance.addHookOnce('afterRemoveRow', redoneCallback);
      instance.alter('remove_row', this.index, this.data.length);
    };

    Handsontable.UndoRedo.CreateColumnAction = function (index, amount) {
      this.index = index;
      this.amount = amount;
    };
    Handsontable.helper.inherit(Handsontable.UndoRedo.CreateColumnAction, Handsontable.UndoRedo.Action);
    Handsontable.UndoRedo.CreateColumnAction.prototype.undo = function (instance, undoneCallback) {
      instance.addHookOnce('afterRemoveCol', undoneCallback);
      instance.alter('remove_col', this.index, this.amount);
    };
    Handsontable.UndoRedo.CreateColumnAction.prototype.redo = function (instance, redoneCallback) {
      instance.addHookOnce('afterCreateCol', redoneCallback);
      instance.alter('insert_col', this.index + 1, this.amount);
    };

    Handsontable.UndoRedo.CellAlignmentAction = function (stateBefore, range, type, alignment) {
      this.stateBefore = stateBefore;
      this.range = range;
      this.type = type;
      this.alignment = alignment;
    };
    Handsontable.UndoRedo.CellAlignmentAction.prototype.undo = function(instance, undoneCallback) {
      if (!instance.contextMenu) {
        return;
      }

      for (var row = this.range.from.row; row <= this.range.to.row; row++) {
        for (var col = this.range.from.col; col <= this.range.to.col; col++) {
          instance.setCellMeta(row, col, 'className', this.stateBefore[row][col] || ' htLeft');
        }
      }

      instance.addHookOnce('afterRender', undoneCallback);
      instance.render();
    };
    Handsontable.UndoRedo.CellAlignmentAction.prototype.redo = function(instance, undoneCallback) {
      if (!instance.contextMenu) {
        return;
      }

      for (var row = this.range.from.row; row <= this.range.to.row; row++) {
        for (var col = this.range.from.col; col <= this.range.to.col; col++) {
          instance.contextMenu.align.call(instance, this.range, this.type, this.alignment);
        }
      }

      instance.addHookOnce('afterRender', undoneCallback);
      instance.render();
    };

    Handsontable.UndoRedo.RemoveColumnAction = function (index, data, headers) {
      this.index = index;
      this.data = data;
      this.amount = this.data[0].length;
      this.headers = headers;
    };
    Handsontable.helper.inherit(Handsontable.UndoRedo.RemoveColumnAction, Handsontable.UndoRedo.Action);
    Handsontable.UndoRedo.RemoveColumnAction.prototype.undo = function (instance, undoneCallback) {
      var row, spliceArgs;
      for (var i = 0, len = instance.getData().length; i < len; i++) {
        row = instance.getSourceDataAtRow(i);

        spliceArgs = [this.index, 0];
        Array.prototype.push.apply(spliceArgs, this.data[i]);

        Array.prototype.splice.apply(row, spliceArgs);

      }

      if(typeof this.headers != 'undefined'){
        spliceArgs = [this.index, 0];
        Array.prototype.push.apply(spliceArgs, this.headers);
        Array.prototype.splice.apply(instance.getSettings().colHeaders, spliceArgs);
      }

      instance.addHookOnce('afterRender', undoneCallback);
      instance.render();
    };
    Handsontable.UndoRedo.RemoveColumnAction.prototype.redo = function (instance, redoneCallback) {
      instance.addHookOnce('afterRemoveCol', redoneCallback);
      instance.alter('remove_col', this.index, this.amount);
    };
  })(Handsontable);

  (function(Handsontable){

    function init(){
      var instance = this;
      var pluginEnabled = typeof instance.getSettings().undo == 'undefined' || instance.getSettings().undo;

      if(pluginEnabled){
        if(!instance.undoRedo){
          /**
           * Instance of Handsontable.UndoRedo Plugin {@link Handsontable.UndoRedo}
           *
           * @alias undoRedo
           * @memberof! Handsontable.Core#
           * @type {UndoRedo}
           */
          instance.undoRedo = new Handsontable.UndoRedo(instance);

          exposeUndoRedoMethods(instance);

          instance.addHook('beforeKeyDown', onBeforeKeyDown);
          instance.addHook('afterChange', onAfterChange);
        }
      } else {
        if(instance.undoRedo){
          delete instance.undoRedo;

          removeExposedUndoRedoMethods(instance);

          instance.removeHook('beforeKeyDown', onBeforeKeyDown);
          instance.removeHook('afterChange', onAfterChange);
        }
      }
    }

    function onBeforeKeyDown(event){
      var instance = this;

      var ctrlDown = (event.ctrlKey || event.metaKey) && !event.altKey;

      if(ctrlDown){
        if (event.keyCode === 89 || (event.shiftKey && event.keyCode === 90)) { //CTRL + Y or CTRL + SHIFT + Z
          instance.undoRedo.redo();
          event.stopImmediatePropagation();
        }
        else if (event.keyCode === 90) { //CTRL + Z
          instance.undoRedo.undo();
          event.stopImmediatePropagation();
        }
      }
    }

    function onAfterChange(changes, source){
      var instance = this;
      if (source == 'loadData'){
        return instance.undoRedo.clear();
      }
    }

    function exposeUndoRedoMethods(instance) {
      /**
       * {@link Handsontable.UndoRedo#undo}
       * @alias undo
       * @memberof! Handsontable.Core#
       */
      instance.undo = function(){
        return instance.undoRedo.undo();
      };

      /**
       * {@link Handsontable.UndoRedo#redo}
       * @alias redo
       * @memberof! Handsontable.Core#
       */
      instance.redo = function(){
        return instance.undoRedo.redo();
      };

      /**
       * {@link Handsontable.UndoRedo#isUndoAvailable}
       * @alias isUndoAvailable
       * @memberof! Handsontable.Core#
       */
      instance.isUndoAvailable = function(){
        return instance.undoRedo.isUndoAvailable();
      };

      /**
       * {@link Handsontable.UndoRedo#isRedoAvailable}
       * @alias isRedoAvailable
       * @memberof! Handsontable.Core#
       */
      instance.isRedoAvailable = function(){
        return instance.undoRedo.isRedoAvailable();
      };

      /**
       * {@link Handsontable.UndoRedo#clear}
       * @alias clearUndo
       * @memberof! Handsontable.Core#
       */
      instance.clearUndo = function(){
        return instance.undoRedo.clear();
      };
    }

    function removeExposedUndoRedoMethods(instance){
      delete instance.undo;
      delete instance.redo;
      delete instance.isUndoAvailable;
      delete instance.isRedoAvailable;
      delete instance.clearUndo;
    }

    Handsontable.hooks.add('afterInit', init);
    Handsontable.hooks.add('afterUpdateSettings', init);

  })(Handsontable);

  /**
   * Plugin used to scroll Handsontable by selecting a cell and dragging outside of visible viewport
   * @constructor
   * @private
   */
  function DragToScroll() {
    this.boundaries = null;
    this.callback = null;
  }

  /**
   * @param boundaries {Object} compatible with getBoundingClientRect
   */
  DragToScroll.prototype.setBoundaries = function (boundaries) {
    this.boundaries = boundaries;
  };

  /**
   * @param callback {Function}
   */
  DragToScroll.prototype.setCallback = function (callback) {
    this.callback = callback;
  };

  /**
   * Check if mouse position (x, y) is outside of the viewport
   * @param x
   * @param y
   */
  DragToScroll.prototype.check = function (x, y) {
    var diffX = 0;
    var diffY = 0;

    if (y < this.boundaries.top) {
      //y is less than top
      diffY = y - this.boundaries.top;
    }
    else if (y > this.boundaries.bottom) {
      //y is more than bottom
      diffY = y - this.boundaries.bottom;
    }

    if (x < this.boundaries.left) {
      //x is less than left
      diffX = x - this.boundaries.left;
    }
    else if (x > this.boundaries.right) {
      //x is more than right
      diffX = x - this.boundaries.right;
    }

    this.callback(diffX, diffY);
  };

  var dragToScroll;
  var instance;

  if (typeof Handsontable !== 'undefined') {
    var setupListening = function (instance) {
      instance.dragToScrollListening = false;
      var scrollHandler = instance.view.wt.wtTable.holder; //native scroll
      dragToScroll = new DragToScroll();
      if (scrollHandler === window) {
        //not much we can do currently
        return;
      }
      else {
        dragToScroll.setBoundaries(scrollHandler.getBoundingClientRect());
      }

      dragToScroll.setCallback(function (scrollX, scrollY) {
        if (scrollX < 0) {
          scrollHandler.scrollLeft -= 50;
        }
        else if (scrollX > 0) {
          scrollHandler.scrollLeft += 50;
        }

        if (scrollY < 0) {
          scrollHandler.scrollTop -= 20;
        }
        else if (scrollY > 0) {
          scrollHandler.scrollTop += 20;
        }
      });

      instance.dragToScrollListening = true;
    };

    Handsontable.hooks.add('afterInit', function () {
      var instance = this;
      var eventManager = Handsontable.eventManager(this);

      eventManager.addEventListener(document,'mouseup', function () {
        instance.dragToScrollListening = false;
      });

      eventManager.addEventListener(document,'mousemove', function (event) {
        if (instance.dragToScrollListening) {
          dragToScroll.check(event.clientX, event.clientY);
        }
      });
    });

    Handsontable.hooks.add('afterDestroy', function () {
      var eventManager = Handsontable.eventManager(this);
      eventManager.clear();
    });

    Handsontable.hooks.add('afterOnCellMouseDown', function () {
      setupListening(this);
    });

    Handsontable.hooks.add('afterOnCellCornerMouseDown', function () {
      setupListening(this);
    });

    Handsontable.plugins.DragToScroll = DragToScroll;
  }

  /**
   * This plugin provides copy and paste functionalities.
   *
   * @plugin
   * @class Handsontable.CopyPaste
   */
  (function (Handsontable, CopyPaste, SheetClip) {

    function CopyPastePlugin(instance) {
      var _this = this;

      this.copyPasteInstance = CopyPaste.getInstance();
      this.copyPasteInstance.onCut(onCut);
      this.copyPasteInstance.onPaste(onPaste);

      instance.addHook('beforeKeyDown', onBeforeKeyDown);

      function onCut() {
        if (!instance.isListening()) {
          return;
        }
        instance.selection.empty();
      }

      function onPaste(str) {
        var
            input,
            inputArray,
            selected,
            coordsFrom,
            coordsTo,
            cellRange,
            topLeftCorner,
            bottomRightCorner,
            areaStart,
            areaEnd;

        if (!instance.isListening() || !instance.selection.isSelected()) {
          return;
        }
        input = str;
        inputArray = SheetClip.parse(input);
        selected = instance.getSelected();
        coordsFrom = new WalkontableCellCoords(selected[0], selected[1]);
        coordsTo = new WalkontableCellCoords(selected[2], selected[3]);
        cellRange = new WalkontableCellRange(coordsFrom, coordsFrom, coordsTo);
        topLeftCorner = cellRange.getTopLeftCorner();
        bottomRightCorner = cellRange.getBottomRightCorner();
        areaStart = topLeftCorner;
        areaEnd = new WalkontableCellCoords(
            Math.max(bottomRightCorner.row, inputArray.length - 1 + topLeftCorner.row),
            Math.max(bottomRightCorner.col, inputArray[0].length - 1 + topLeftCorner.col)
        );

        instance.addHookOnce('afterChange', function (changes, source) {
          if (changes && changes.length) {
            this.selectCell(areaStart.row, areaStart.col, areaEnd.row, areaEnd.col);
          }
        });

        instance.populateFromArray(areaStart.row, areaStart.col, inputArray, areaEnd.row, areaEnd.col, 'paste', instance.getSettings().pasteMode);
      }

      function onBeforeKeyDown (event) {
        var ctrlDown;

        if (instance.getSelected()) {
          if (Handsontable.helper.isCtrlKey(event.keyCode)) {
            // when CTRL is pressed, prepare selectable text in textarea
            // http://stackoverflow.com/questions/3902635/how-does-one-capture-a-macs-command-key-via-javascript
            _this.setCopyableText();
            event.stopImmediatePropagation();

            return;
          }
          // catch CTRL but not right ALT (which in some systems triggers ALT+CTRL)
          ctrlDown = (event.ctrlKey || event.metaKey) && !event.altKey;

          if (event.keyCode == Handsontable.helper.keyCode.A && ctrlDown) {
            instance._registerTimeout(setTimeout(Handsontable.helper.proxy(_this.setCopyableText, _this), 0));
          }
        }
      }

      /**
       * Destroy plugin instance.
       *
       * @function destroy
       * @memberof Handsontable.CopyPaste#
       */
      this.destroy = function () {
        this.copyPasteInstance.removeCallback(onCut);
        this.copyPasteInstance.removeCallback(onPaste);
        this.copyPasteInstance.destroy();
        instance.removeHook('beforeKeyDown', onBeforeKeyDown);
      };

      instance.addHook('afterDestroy', Handsontable.helper.proxy(this.destroy, this));

      /**
       * @function triggerPaste
       * @memberof Handsontable.CopyPaste#
       */
      this.triggerPaste = Handsontable.helper.proxy(this.copyPasteInstance.triggerPaste, this.copyPasteInstance);

      /**
       * @function triggerCut
       * @memberof Handsontable.CopyPaste#
       */
      this.triggerCut = Handsontable.helper.proxy(this.copyPasteInstance.triggerCut, this.copyPasteInstance);

      /**
       * Prepares copyable text in the invisible textarea.
       *
       * @function setCopyable
       * @memberof Handsontable.CopyPaste#
       */
      this.setCopyableText = function () {
        var settings = instance.getSettings();
        var copyRowsLimit = settings.copyRowsLimit;
        var copyColsLimit = settings.copyColsLimit;

        var selRange = instance.getSelectedRange();
        var topLeft = selRange.getTopLeftCorner();
        var bottomRight = selRange.getBottomRightCorner();
        var startRow = topLeft.row;
        var startCol = topLeft.col;
        var endRow = bottomRight.row;
        var endCol = bottomRight.col;
        var finalEndRow = Math.min(endRow, startRow + copyRowsLimit - 1);
        var finalEndCol = Math.min(endCol, startCol + copyColsLimit - 1);

        instance.copyPaste.copyPasteInstance.copyable(instance.getCopyableData(startRow, startCol, finalEndRow, finalEndCol));

        if (endRow !== finalEndRow || endCol !== finalEndCol) {
          Handsontable.hooks.run(instance, "afterCopyLimit", endRow - startRow + 1, endCol - startCol + 1, copyRowsLimit, copyColsLimit);
        }
      };
    }

    /**
     * Init plugin
     *
     * @function init
     * @memberof Handsontable.CopyPaste#
     */
    function init() {
      var instance  = this,
          pluginEnabled = instance.getSettings().copyPaste !== false;

      if (pluginEnabled && !instance.copyPaste) {
        /**
         * Instance of CopyPaste Plugin {@link Handsontable.CopyPaste}
         * @alias copyPaste
         * @memberof! Handsontable.Core#
         * @type {CopyPaste}
         */
        instance.copyPaste = new CopyPastePlugin(instance);

      } else if (!pluginEnabled && instance.copyPaste) {
        instance.copyPaste.destroy();
        delete instance.copyPaste;
      }
    }

    Handsontable.hooks.add('afterInit', init);
    Handsontable.hooks.add('afterUpdateSettings', init);

    Handsontable.hooks.register('afterCopyLimit');
  })(Handsontable, CopyPaste, SheetClip);
  (function (Handsontable) {

    'use strict';

    Handsontable.Search = function Search(instance) {
      this.query = function (queryStr, callback, queryMethod) {
        var rowCount = instance.countRows();
        var colCount = instance.countCols();
        var queryResult = [];

        if (!callback) {
          callback = Handsontable.Search.global.getDefaultCallback();
        }

        if (!queryMethod) {
          queryMethod = Handsontable.Search.global.getDefaultQueryMethod();
        }

        for (var rowIndex = 0; rowIndex < rowCount; rowIndex++) {
          for (var colIndex = 0; colIndex < colCount; colIndex++) {
            var cellData = instance.getDataAtCell(rowIndex, colIndex);
            var cellProperties = instance.getCellMeta(rowIndex, colIndex);
            var cellCallback = cellProperties.search.callback || callback;
            var cellQueryMethod = cellProperties.search.queryMethod || queryMethod;
            var testResult = cellQueryMethod(queryStr, cellData);

            if (testResult) {
              var singleResult = {
                row: rowIndex,
                col: colIndex,
                data: cellData
              };

              queryResult.push(singleResult);
            }

            if (cellCallback) {
              cellCallback(instance, rowIndex, colIndex, cellData, testResult);
            }
          }
        }

        return queryResult;

      };

    };

    Handsontable.Search.DEFAULT_CALLBACK = function (instance, row, col, data, testResult) {
      instance.getCellMeta(row, col).isSearchResult = testResult;
    };

    Handsontable.Search.DEFAULT_QUERY_METHOD = function (query, value) {

      if (typeof query == 'undefined' || query == null || !query.toLowerCase || query.length === 0){
        return false;
      }

      if(typeof value == 'undefined' || value == null) {
        return false;
      }

      return value.toString().toLowerCase().indexOf(query.toLowerCase()) != -1;
    };

    Handsontable.Search.DEFAULT_SEARCH_RESULT_CLASS = 'htSearchResult';

    Handsontable.Search.global = (function () {

      var defaultCallback = Handsontable.Search.DEFAULT_CALLBACK;
      var defaultQueryMethod = Handsontable.Search.DEFAULT_QUERY_METHOD;
      var defaultSearchResultClass = Handsontable.Search.DEFAULT_SEARCH_RESULT_CLASS;

      return {
        getDefaultCallback: function () {
          return defaultCallback;
        },

        setDefaultCallback: function (newDefaultCallback) {
          defaultCallback = newDefaultCallback;
        },

        getDefaultQueryMethod: function () {
          return defaultQueryMethod;
        },

        setDefaultQueryMethod: function (newDefaultQueryMethod) {
          defaultQueryMethod = newDefaultQueryMethod;
        },

        getDefaultSearchResultClass: function () {
          return defaultSearchResultClass;
        },

        setDefaultSearchResultClass: function (newSearchResultClass) {
          defaultSearchResultClass = newSearchResultClass;
        }
      };

    })();



    Handsontable.SearchCellDecorator = function (instance, TD, row, col, prop, value, cellProperties) {

      var searchResultClass = (typeof cellProperties.search == 'object' && cellProperties.search.searchResultClass) || Handsontable.Search.global.getDefaultSearchResultClass();

      if(cellProperties.isSearchResult){
        Handsontable.Dom.addClass(TD, searchResultClass);
      } else {
        Handsontable.Dom.removeClass(TD, searchResultClass);
      }
    };



    var originalDecorator = Handsontable.renderers.cellDecorator;

    Handsontable.renderers.cellDecorator = function (instance, TD, row, col, prop, value, cellProperties) {
      originalDecorator.apply(this, arguments);
      Handsontable.SearchCellDecorator.apply(this, arguments);
    };

    function init() {
      /* jshint ignore:start */
      var instance = this;
      /* jshint ignore:end */

      var pluginEnabled = !!instance.getSettings().search;

      if (pluginEnabled) {
        instance.search = new Handsontable.Search(instance);
      } else {
        delete instance.search;
      }
    }

    Handsontable.hooks.add('afterInit', init);
    Handsontable.hooks.add('afterUpdateSettings', init);


  })(Handsontable);

  function CellInfoCollection() {

    var collection = [];

    collection.getInfo = function (row, col) {
      for (var i = 0, ilen = this.length; i < ilen; i++) {
        if (this[i].row <= row && this[i].row + this[i].rowspan - 1 >= row && this[i].col <= col && this[i].col + this[i].colspan - 1 >= col) {
          return this[i];
        }
      }
    };

    collection.setInfo = function (info) {
      for (var i = 0, ilen = this.length; i < ilen; i++) {
        if (this[i].row === info.row && this[i].col === info.col) {
          this[i] = info;
          return;
        }
      }
      this.push(info);
    };

    collection.removeInfo = function (row, col) {
      for (var i = 0, ilen = this.length; i < ilen; i++) {
        if (this[i].row === row && this[i].col === col) {
          this.splice(i, 1);
          break;
        }
      }
    };

    return collection;

  }


  /**
   * Plugin used to merge cells in Handsontable
   * @constructor
   * @private
   */
  function MergeCells(mergeCellsSetting) {
    this.mergedCellInfoCollection = new CellInfoCollection();

    if (Array.isArray(mergeCellsSetting)) {
      for (var i = 0, ilen = mergeCellsSetting.length; i < ilen; i++) {
        this.mergedCellInfoCollection.setInfo(mergeCellsSetting[i]);
      }
    }
  }

  /**
   * @param cellRange (WalkontableCellRange)
   */
  MergeCells.prototype.canMergeRange = function (cellRange) {
    //is more than one cell selected
    return !cellRange.isSingle();
  };

  MergeCells.prototype.mergeRange = function (cellRange) {
    if (!this.canMergeRange(cellRange)) {
      return;
    }

    //normalize top left corner
    var topLeft = cellRange.getTopLeftCorner();
    var bottomRight = cellRange.getBottomRightCorner();

    var mergeParent = {};
    mergeParent.row = topLeft.row;
    mergeParent.col = topLeft.col;
    mergeParent.rowspan = bottomRight.row - topLeft.row + 1; //TD has rowspan == 1 by default. rowspan == 2 means spread over 2 cells
    mergeParent.colspan = bottomRight.col - topLeft.col + 1;
    this.mergedCellInfoCollection.setInfo(mergeParent);
  };

  MergeCells.prototype.mergeOrUnmergeSelection = function (cellRange) {
    var info = this.mergedCellInfoCollection.getInfo(cellRange.from.row, cellRange.from.col);
    if (info) {
      //unmerge
      this.unmergeSelection(cellRange.from);
    }
    else {
      //merge
      this.mergeSelection(cellRange);
    }
  };

  MergeCells.prototype.mergeSelection = function (cellRange) {
    this.mergeRange(cellRange);
  };

  MergeCells.prototype.unmergeSelection = function (cellRange) {
    var info = this.mergedCellInfoCollection.getInfo(cellRange.row, cellRange.col);
    this.mergedCellInfoCollection.removeInfo(info.row, info.col);
  };

  MergeCells.prototype.applySpanProperties = function (TD, row, col) {
    var info = this.mergedCellInfoCollection.getInfo(row, col);

    if (info) {
      if (info.row === row && info.col === col) {
        TD.setAttribute('rowspan', info.rowspan);
        TD.setAttribute('colspan', info.colspan);
      }
      else {
        TD.removeAttribute('rowspan');
        TD.removeAttribute('colspan');

        TD.style.display = "none";
      }
    }
    else {
      TD.removeAttribute('rowspan');
      TD.removeAttribute('colspan');
    }
  };

  MergeCells.prototype.modifyTransform = function (hook, currentSelectedRange, delta) {
    var sameRowspan = function (merged, coords) {
          if (coords.row >= merged.row && coords.row <= (merged.row + merged.rowspan - 1)) {
            return true;
          }
          return false;
        }
        , sameColspan = function (merged, coords) {
          if (coords.col >= merged.col && coords.col <= (merged.col + merged.colspan - 1)) {
            return true;
          }
          return false;
        }
        , getNextPosition = function (newDelta) {
          return new WalkontableCellCoords(currentSelectedRange.to.row + newDelta.row, currentSelectedRange.to.col + newDelta.col);
        };

    var newDelta = {
      row: delta.row,
      col: delta.col
    };


    if (hook == 'modifyTransformStart') {

      if (!this.lastDesiredCoords) {
        this.lastDesiredCoords = new WalkontableCellCoords(null, null);
      }
      var currentPosition = new WalkontableCellCoords(currentSelectedRange.highlight.row, currentSelectedRange.highlight.col)
          , mergedParent = this.mergedCellInfoCollection.getInfo(currentPosition.row, currentPosition.col)// if current position's parent is a merged range, returns it
          , currentRangeContainsMerge; // if current range contains a merged range

      for (var i = 0, mergesLength = this.mergedCellInfoCollection.length; i < mergesLength; i++) {
        var range = this.mergedCellInfoCollection[i];
        range = new WalkontableCellCoords(range.row + range.rowspan - 1, range.col + range.colspan - 1);
        if (currentSelectedRange.includes(range)) {
          currentRangeContainsMerge = true;
          break;
        }
      }

      if (mergedParent) { // only merge selected
        var mergeTopLeft = new WalkontableCellCoords(mergedParent.row, mergedParent.col)
            , mergeBottomRight = new WalkontableCellCoords(mergedParent.row + mergedParent.rowspan - 1, mergedParent.col + mergedParent.colspan - 1)
            , mergeRange = new WalkontableCellRange(mergeTopLeft, mergeTopLeft, mergeBottomRight);

        if (!mergeRange.includes(this.lastDesiredCoords)) {
          this.lastDesiredCoords = new WalkontableCellCoords(null, null); // reset outdated version of lastDesiredCoords
        }

        newDelta.row = this.lastDesiredCoords.row ? this.lastDesiredCoords.row - currentPosition.row : newDelta.row;
        newDelta.col = this.lastDesiredCoords.col ? this.lastDesiredCoords.col - currentPosition.col : newDelta.col;

        if (delta.row > 0) { // moving down
          newDelta.row = mergedParent.row + mergedParent.rowspan - 1 - currentPosition.row + delta.row;
        } else if (delta.row < 0) { //moving up
          newDelta.row = currentPosition.row - mergedParent.row + delta.row;
        }
        if (delta.col > 0) { // moving right
          newDelta.col = mergedParent.col + mergedParent.colspan - 1 - currentPosition.col + delta.col;
        } else if (delta.col < 0) { // moving left
          newDelta.col = currentPosition.col - mergedParent.col + delta.col;
        }
      }

      var nextPosition = new WalkontableCellCoords(currentSelectedRange.highlight.row + newDelta.row, currentSelectedRange.highlight.col + newDelta.col)
          , nextParentIsMerged = this.mergedCellInfoCollection.getInfo(nextPosition.row, nextPosition.col);

      if (nextParentIsMerged) { // skipping the invisible cells in the merge range
        this.lastDesiredCoords = nextPosition;
        newDelta = {
          row: nextParentIsMerged.row - currentPosition.row,
          col: nextParentIsMerged.col - currentPosition.col
        };
      }
    } else if (hook == 'modifyTransformEnd') {
      for (var i = 0, mergesLength = this.mergedCellInfoCollection.length; i < mergesLength; i++) {
        var currentMerge = this.mergedCellInfoCollection[i]
            , mergeTopLeft = new WalkontableCellCoords(currentMerge.row, currentMerge.col)
            , mergeBottomRight = new WalkontableCellCoords(currentMerge.row + currentMerge.rowspan - 1, currentMerge.col + currentMerge.colspan - 1)
            , mergedRange = new WalkontableCellRange(mergeTopLeft, mergeTopLeft, mergeBottomRight)
            , sharedBorders = currentSelectedRange.getBordersSharedWith(mergedRange);

        if (mergedRange.isEqual(currentSelectedRange)) { // only the merged range is selected
          currentSelectedRange.setDirection("NW-SE");
        }
        else if (sharedBorders.length > 0) {
          var mergeHighlighted = (currentSelectedRange.highlight.isEqual(mergedRange.from));

          if (sharedBorders.indexOf('top') > -1) { // if range shares a border with the merged section, change range direction accordingly
            if (currentSelectedRange.to.isSouthEastOf(mergedRange.from) && mergeHighlighted) {
              currentSelectedRange.setDirection("NW-SE");
            } else if (currentSelectedRange.to.isSouthWestOf(mergedRange.from) && mergeHighlighted) {
              currentSelectedRange.setDirection("NE-SW");
            }
          } else if (sharedBorders.indexOf('bottom') > -1) {
            if (currentSelectedRange.to.isNorthEastOf(mergedRange.from) && mergeHighlighted) {
              currentSelectedRange.setDirection("SW-NE");
            } else if (currentSelectedRange.to.isNorthWestOf(mergedRange.from) && mergeHighlighted) {
              currentSelectedRange.setDirection("SE-NW");
            }
          }
        }

        var nextPosition = getNextPosition(newDelta)
            , withinRowspan = sameRowspan(currentMerge, nextPosition)
            , withinColspan = sameColspan(currentMerge, nextPosition);

        if (currentSelectedRange.includesRange(mergedRange) && (mergedRange.includes(nextPosition) || withinRowspan || withinColspan)) { // if next step overlaps a merged range, jump past it
          if (withinRowspan) {
            if (newDelta.row < 0) {
              newDelta.row -= currentMerge.rowspan - 1;
            } else if (newDelta.row > 0) {
              newDelta.row += currentMerge.rowspan - 1;
            }
          }
          if (withinColspan) {
            if (newDelta.col < 0) {
              newDelta.col -= currentMerge.colspan - 1;
            } else if (newDelta.col > 0) {
              newDelta.col += currentMerge.colspan - 1;
            }
          }
        }
      }
    }

    if (newDelta.row !== 0) {
      delta.row = newDelta.row;
    }
    if (newDelta.col !== 0) {
      delta.col = newDelta.col;
    }
  };

  if (typeof Handsontable == 'undefined') {
    throw new Error('Handsontable is not defined');
  }

  var beforeInit = function () {
    var instance = this;
    var mergeCellsSetting = instance.getSettings().mergeCells;

    if (mergeCellsSetting) {
      if (!instance.mergeCells) {
        instance.mergeCells = new MergeCells(mergeCellsSetting);
      }
    }
  };

  var afterInit = function () {
    var instance = this;
    if (instance.mergeCells) {
      /**
       * Monkey patch WalkontableTable.prototype.getCell to return TD for merged cell parent if asked for TD of a cell that is
       * invisible due to the merge. This is not the cleanest solution but there is a test case for it (merged cells scroll) so feel free to refactor it!
       */
      instance.view.wt.wtTable.getCell = function (coords) {
        if (instance.getSettings().mergeCells) {
          var mergeParent = instance.mergeCells.mergedCellInfoCollection.getInfo(coords.row, coords.col);
          if (mergeParent) {
            coords = mergeParent;
          }
        }
        return WalkontableTable.prototype.getCell.call(this, coords);
      };
    }
  };

  var onBeforeKeyDown = function (event) {
    if (!this.mergeCells) {
      return;
    }

    var ctrlDown = (event.ctrlKey || event.metaKey) && !event.altKey;

    if (ctrlDown) {
      if (event.keyCode === 77) { //CTRL + M
        this.mergeCells.mergeOrUnmergeSelection(this.getSelectedRange());
        this.render();
        event.stopImmediatePropagation();
      }
    }
  };

  var addMergeActionsToContextMenu = function (defaultOptions) {
    if (!this.getSettings().mergeCells) {
      return;
    }

    defaultOptions.items.push(Handsontable.ContextMenu.SEPARATOR);

    defaultOptions.items.push({
      key: 'mergeCells',
      name: function () {
        var sel = this.getSelected();
        var info = this.mergeCells.mergedCellInfoCollection.getInfo(sel[0], sel[1]);
        if (info) {
          return 'Unmerge cells';
        }
        else {
          return 'Merge cells';
        }
      },
      callback: function () {
        this.mergeCells.mergeOrUnmergeSelection(this.getSelectedRange());
        this.render();
      },
      disabled: function () {
        return false;
      }
    });
  };

  var afterRenderer = function (TD, row, col, prop, value, cellProperties) {
    if (this.mergeCells) {
      this.mergeCells.applySpanProperties(TD, row, col);
    }
  };

  var modifyTransformFactory = function (hook) {
    return function (delta) {
      var mergeCellsSetting = this.getSettings().mergeCells;
      if (mergeCellsSetting) {
        var currentSelectedRange = this.getSelectedRange();
        this.mergeCells.modifyTransform(hook, currentSelectedRange, delta);

        if (hook === "modifyTransformEnd") {
          //sanitize "from" (core.js will sanitize to)
          var totalRows = this.countRows();
          var totalCols = this.countCols();
          if (currentSelectedRange.from.row < 0) {
            currentSelectedRange.from.row = 0;
          }
          else if (currentSelectedRange.from.row > 0 && currentSelectedRange.from.row >= totalRows) {
            currentSelectedRange.from.row = currentSelectedRange.from - 1;
          }

          if (currentSelectedRange.from.col < 0) {
            currentSelectedRange.from.col = 0;
          }
          else if (currentSelectedRange.from.col > 0 && currentSelectedRange.from.col >= totalCols) {
            currentSelectedRange.from.col = totalCols - 1;
          }
        }
      }
    };
  };

  /**
   * While selecting cells with keyboard or mouse, make sure that rectangular area is expanded to the extent of the merged cell
   * @param coords
   */
  var beforeSetRangeEnd = function (coords) {

    this.lastDesiredCoords = null; //unset lastDesiredCoords when selection is changed with mouse
    var mergeCellsSetting = this.getSettings().mergeCells;
    if (mergeCellsSetting) {
      var selRange = this.getSelectedRange();
      selRange.highlight = new WalkontableCellCoords(selRange.highlight.row, selRange.highlight.col); //clone in case we will modify its reference
      selRange.to = coords;

      var rangeExpanded = false;
      do {
        rangeExpanded = false;

        for (var i = 0, ilen = this.mergeCells.mergedCellInfoCollection.length; i < ilen; i++) {
          var cellInfo = this.mergeCells.mergedCellInfoCollection[i];
          var mergedCellTopLeft = new WalkontableCellCoords(cellInfo.row, cellInfo.col);
          var mergedCellBottomRight = new WalkontableCellCoords(cellInfo.row + cellInfo.rowspan - 1, cellInfo.col + cellInfo.colspan - 1);

          var mergedCellRange = new WalkontableCellRange(mergedCellTopLeft, mergedCellTopLeft, mergedCellBottomRight);
          if (selRange.expandByRange(mergedCellRange)) {
            coords.row = selRange.to.row;
            coords.col = selRange.to.col;

            rangeExpanded = true;
          }
        }
      } while (rangeExpanded);

    }
  };

  /**
   * Returns correct coordinates for merged start / end cells in selection for area borders
   * @param corners
   * @param className
   */
  var beforeDrawAreaBorders = function (corners, className) {
    if (className && className == 'area') {
      var mergeCellsSetting = this.getSettings().mergeCells;
      if (mergeCellsSetting) {
        var selRange = this.getSelectedRange();
        var startRange = new WalkontableCellRange(selRange.from, selRange.from, selRange.from);
        var stopRange = new WalkontableCellRange(selRange.to, selRange.to, selRange.to);

        for (var i = 0, ilen = this.mergeCells.mergedCellInfoCollection.length; i < ilen; i++) {
          var cellInfo = this.mergeCells.mergedCellInfoCollection[i];
          var mergedCellTopLeft = new WalkontableCellCoords(cellInfo.row, cellInfo.col);
          var mergedCellBottomRight = new WalkontableCellCoords(cellInfo.row + cellInfo.rowspan - 1, cellInfo.col + cellInfo.colspan - 1);
          var mergedCellRange = new WalkontableCellRange(mergedCellTopLeft, mergedCellTopLeft, mergedCellBottomRight);

          if (startRange.expandByRange(mergedCellRange)) {
            corners[0] = startRange.from.row;
            corners[1] = startRange.from.col;
          }

          if (stopRange.expandByRange(mergedCellRange)) {
            corners[2] = stopRange.from.row;
            corners[3] = stopRange.from.col;
          }
        }
      }
    }
  };

  var afterGetCellMeta = function (row, col, cellProperties) {
    var mergeCellsSetting = this.getSettings().mergeCells;
    if (mergeCellsSetting) {
      var mergeParent = this.mergeCells.mergedCellInfoCollection.getInfo(row, col);
      if (mergeParent && (mergeParent.row != row || mergeParent.col != col)) {
        cellProperties.copyable = false;
      }
    }
  };

  var afterViewportRowCalculatorOverride = function (calc) {
    var mergeCellsSetting = this.getSettings().mergeCells;
    if (mergeCellsSetting) {
      var colCount = this.countCols();
      var mergeParent;
      for (var c = 0; c < colCount; c++) {
        mergeParent = this.mergeCells.mergedCellInfoCollection.getInfo(calc.startRow, c);
        if (mergeParent) {
          if (mergeParent.row < calc.startRow) {
            calc.startRow = mergeParent.row;
            return afterViewportRowCalculatorOverride.call(this, calc); //recursively search upwards
          }
        }
        mergeParent = this.mergeCells.mergedCellInfoCollection.getInfo(calc.endRow, c);
        if (mergeParent) {
          var mergeEnd = mergeParent.row + mergeParent.rowspan - 1;
          if (mergeEnd > calc.endRow) {
            calc.endRow = mergeEnd;
            return afterViewportRowCalculatorOverride.call(this, calc); //recursively search upwards
          }
        }
      }
    }
  };

  var afterViewportColumnCalculatorOverride = function (calc) {
    var mergeCellsSetting = this.getSettings().mergeCells;
    if (mergeCellsSetting) {
      var rowCount = this.countRows();
      var mergeParent;
      for (var r = 0; r < rowCount; r++) {
        mergeParent = this.mergeCells.mergedCellInfoCollection.getInfo(r, calc.startColumn);

        if (mergeParent) {
          if (mergeParent.col < calc.startColumn) {
            calc.startColumn = mergeParent.col;
            return afterViewportColumnCalculatorOverride.call(this, calc); //recursively search upwards
          }
        }
        mergeParent = this.mergeCells.mergedCellInfoCollection.getInfo(r, calc.endColumn);
        if (mergeParent) {
          var mergeEnd = mergeParent.col + mergeParent.colspan - 1;
          if (mergeEnd > calc.endColumn) {
            calc.endColumn = mergeEnd;
            return afterViewportColumnCalculatorOverride.call(this, calc); //recursively search upwards
          }
        }
      }
    }
  };

  var isMultipleSelection = function (isMultiple) {
    if (isMultiple && this.mergeCells) {
      var mergedCells = this.mergeCells.mergedCellInfoCollection
          , selectionRange = this.getSelectedRange();

      for (var group in mergedCells) {
        if (selectionRange.highlight.row == mergedCells[group].row && selectionRange.highlight.col == mergedCells[group].col &&
            selectionRange.to.row == mergedCells[group].row + mergedCells[group].rowspan - 1 &&
            selectionRange.to.col == mergedCells[group].col + mergedCells[group].colspan - 1) {
          return false;
        }
      }
    }
    return isMultiple;
  };

  Handsontable.hooks.add('beforeInit', beforeInit);
  Handsontable.hooks.add('afterInit', afterInit);
  Handsontable.hooks.add('beforeKeyDown', onBeforeKeyDown);
  Handsontable.hooks.add('modifyTransformStart', modifyTransformFactory('modifyTransformStart'));
  Handsontable.hooks.add('modifyTransformEnd', modifyTransformFactory('modifyTransformEnd'));
  Handsontable.hooks.add('beforeSetRangeEnd', beforeSetRangeEnd);
  Handsontable.hooks.add('beforeDrawBorders', beforeDrawAreaBorders);
  Handsontable.hooks.add('afterIsMultipleSelection', isMultipleSelection);
  Handsontable.hooks.add('afterRenderer', afterRenderer);
  Handsontable.hooks.add('afterContextMenuDefaultOptions', addMergeActionsToContextMenu);
  Handsontable.hooks.add('afterGetCellMeta', afterGetCellMeta);
  Handsontable.hooks.add('afterViewportRowCalculatorOverride', afterViewportRowCalculatorOverride);
  Handsontable.hooks.add('afterViewportColumnCalculatorOverride', afterViewportColumnCalculatorOverride);

  Handsontable.MergeCells = MergeCells;


  (function () {

    function CustomBorders () {

    }

//  /***
//   * Array for all custom border objects (for redraw)
//   * @type {{}}
//   */
//  var bordersArray = {},
    /***
     * Current instance (table where borders should be placed)
     */
    var instance;


    /***
     * Check if plugin should be enabled
     */
    var checkEnable = function (customBorders) {
      if(typeof customBorders === "boolean"){
        if (customBorders === true){
          return true;
        }
      }

      if(typeof customBorders === "object"){
        if(customBorders.length > 0) {
          return true;
        }
      }
      return false;
    };


    /***
     * Initialize plugin
     */
    var init = function () {

      if(checkEnable(this.getSettings().customBorders)){
        if(!this.customBorders){
          instance = this;
          this.customBorders = new CustomBorders();
        }
      }
    };

    /***
     * get index of border setting
     * @param className
     * @returns {number}
     */
    var getSettingIndex = function (className) {
      for (var i = 0; i < instance.view.wt.selections.length; i++){
        if (instance.view.wt.selections[i].settings.className == className){
          return i;
        }
      }
      return -1;
    };

    /***
     * Insert WalkontableSelection instance into Walkontable.settings
     * @param border
     */
    var insertBorderIntoSettings = function (border) {
      var coordinates = {
        row: border.row,
        col: border.col
      };
      var selection = new WalkontableSelection(border, new WalkontableCellRange(coordinates, coordinates, coordinates));
      var index = getSettingIndex(border.className);

      if(index >=0) {
        instance.view.wt.selections[index] = selection;
      } else {
        instance.view.wt.selections.push(selection);
      }
    };

    /***
     * Prepare borders from setting (single cell)
     *
     * @param row
     * @param col
     * @param borderObj
     */
    var prepareBorderFromCustomAdded = function (row, col, borderObj){
      var border = createEmptyBorders(row, col);
      border = extendDefaultBorder(border, borderObj);
      this.setCellMeta(row, col, 'borders', border);

      insertBorderIntoSettings(border);
    };

    /***
     * Prepare borders from setting (object)
     * @param rowObj
     */
    var prepareBorderFromCustomAddedRange = function (rowObj) {
      var range = rowObj.range;

      for (var row = range.from.row; row <= range.to.row; row ++) {
        for (var col = range.from.col; col<= range.to.col; col++){

          var border = createEmptyBorders(row, col);
          var add = 0;

          if(row == range.from.row) {
            add++;
            if(rowObj.hasOwnProperty('top')){
              border.top = rowObj.top;
            }
          }

          if(row == range.to.row){
            add++;
            if(rowObj.hasOwnProperty('bottom')){
              border.bottom = rowObj.bottom;
            }
          }

          if(col == range.from.col) {
            add++;
            if(rowObj.hasOwnProperty('left')){
              border.left = rowObj.left;
            }
          }


          if (col == range.to.col) {
            add++;
            if(rowObj.hasOwnProperty('right')){
              border.right = rowObj.right;
            }
          }


          if(add>0){
            this.setCellMeta(row, col, 'borders', border);
            insertBorderIntoSettings(border);
          }
        }
      }
    };

    /***
     * Create separated class name for borders for each cell
     * @param row
     * @param col
     * @returns {string}
     */
    var createClassName = function (row, col) {
      return "border_row" + row + "col" + col;
    };


    /***
     * Create default single border for each position (top/right/bottom/left)
     * @returns {{width: number, color: string}}
     */
    var createDefaultCustomBorder = function () {
      return {
        width: 1,
        color: '#000'
      };
    };


    /***
     * Create default object for empty border
     * @returns {{hide: boolean}}
     */
    var createSingleEmptyBorder = function () {
      return {
        hide: true
      };
    };


    /***
     * Create default Handsontable border object
     * @returns {{width: number, color: string, cornerVisible: boolean}}
     */
    var createDefaultHtBorder = function () {
      return {
        width: 1,
        color: '#000',
        cornerVisible: false
      };
    };

    /***
     * Prepare empty border for each cell with all custom borders hidden
     *
     * @param row
     * @param col
     * @returns {{className: *, border: *, row: *, col: *, top: {hide: boolean}, right: {hide: boolean}, bottom: {hide: boolean}, left: {hide: boolean}}}
     */
    var createEmptyBorders = function (row, col){
      return {
        className: createClassName(row, col),
        border: createDefaultHtBorder(),
        row: row,
        col: col,
        top: createSingleEmptyBorder(),
        right: createSingleEmptyBorder(),
        bottom: createSingleEmptyBorder(),
        left: createSingleEmptyBorder()
      };
    };


    var extendDefaultBorder = function (defaultBorder, customBorder){

      if(customBorder.hasOwnProperty('border')){
        defaultBorder.border = customBorder.border;
      }

      if(customBorder.hasOwnProperty('top')){
        defaultBorder.top = customBorder.top;
      }

      if(customBorder.hasOwnProperty('right')){
        defaultBorder.right = customBorder.right;
      }

      if(customBorder.hasOwnProperty('bottom')){
        defaultBorder.bottom = customBorder.bottom;
      }

      if(customBorder.hasOwnProperty('left')){
        defaultBorder.left = customBorder.left;
      }
      return defaultBorder;
    };

    /***
     * Remove borders divs from DOM
     *
     * @param borderClassName
     */
    var removeBordersFromDom = function (borderClassName) {
      var borders = document.querySelectorAll("." + borderClassName);

      for(var i = 0; i< borders.length; i++) {
        if (borders[i]) {
          if(borders[i].nodeName != 'TD') {
            var parent = borders[i].parentNode;
            if(parent.parentNode) {
              parent.parentNode.removeChild(parent);
            }
          }
        }
      }
    };


    /***
     * Remove border (triggered from context menu)
     *
     * @param row
     * @param col
     */
    var removeAllBorders = function(row,col) {
      var borderClassName = createClassName(row,col);
      removeBordersFromDom(borderClassName);
      this.removeCellMeta(row, col, 'borders');
    };

    /***
     * Set borders for each cell re. to border position
     *
     * @param row
     * @param col
     * @param place
     * @param remove
     */
    var setBorder = function (row, col,place, remove){

      var bordersMeta = this.getCellMeta(row, col).borders;
      /* jshint ignore:start */
      if (!bordersMeta || bordersMeta.border == undefined){
        bordersMeta = createEmptyBorders(row, col);
      }
      /* jshint ignore:end */

      if (remove) {
        bordersMeta[place] = createSingleEmptyBorder();
      } else {
        bordersMeta[place] = createDefaultCustomBorder();
      }

      this.setCellMeta(row, col, 'borders', bordersMeta);

      var borderClassName = createClassName(row,col);
      removeBordersFromDom(borderClassName);
      insertBorderIntoSettings(bordersMeta);

      this.render();
    };


    /***
     * Prepare borders based on cell and border position
     *
     * @param range
     * @param place
     * @param remove
     */
    var prepareBorder = function (range, place, remove) {

      if (range.from.row == range.to.row && range.from.col == range.to.col){
        if(place == "noBorders"){
          removeAllBorders.call(this, range.from.row, range.from.col);
        } else {
          setBorder.call(this, range.from.row, range.from.col, place, remove);
        }
      } else {
        switch (place) {
          case "noBorders":
            for(var column = range.from.col; column <= range.to.col; column++){
              for(var row = range.from.row; row <= range.to.row; row++) {
                removeAllBorders.call(this, row, column);
              }
            }
            break;
          case "top":
            for(var topCol = range.from.col; topCol <= range.to.col; topCol++){
              setBorder.call(this, range.from.row, topCol, place, remove);
            }
            break;
          case "right":
            for(var rowRight = range.from.row; rowRight <=range.to.row; rowRight++){
              setBorder.call(this,rowRight, range.to.col, place);
            }
            break;
          case "bottom":
            for(var bottomCol = range.from.col; bottomCol <= range.to.col; bottomCol++){
              setBorder.call(this, range.to.row, bottomCol, place);
            }
            break;
          case "left":
            for(var rowLeft = range.from.row; rowLeft <=range.to.row; rowLeft++){
              setBorder.call(this,rowLeft, range.from.col, place);
            }
            break;
        }
      }
    };

    /***
     * Check if selection has border by className
     *
     * @param hot
     * @param direction
     */
    var checkSelectionBorders = function (hot, direction) {
      var atLeastOneHasBorder = false;

      hot.getSelectedRange().forAll(function(r, c) {
        var metaBorders = hot.getCellMeta(r,c).borders;

        if (metaBorders) {
          if(direction) {
            if (!metaBorders[direction].hasOwnProperty('hide')){
              atLeastOneHasBorder = true;
              return false; //breaks forAll
            }
          } else {
            atLeastOneHasBorder = true;
            return false; //breaks forAll
          }
        }
      });
      return atLeastOneHasBorder;
    };


    /***
     * Mark label in contextMenu as selected
     *
     * @param label
     * @returns {string}
     */
    var markSelected = function (label) {
      return "<span class='selected'>" + String.fromCharCode(10003) + "</span>" + label; // workaround for https://github.com/handsontable/handsontable/issues/1946
    };

    /***
     * Add border options to context menu
     *
     * @param defaultOptions
     */
    var addBordersOptionsToContextMenu = function (defaultOptions) {
      if(!this.getSettings().customBorders){
        return;
      }

      defaultOptions.items.push(Handsontable.ContextMenu.SEPARATOR);

      defaultOptions.items.push({
        key: 'borders',
        name: 'Borders',
        submenu: {
          items: {
            top: {
              name: function () {
                var label = "Top";
                var hasBorder = checkSelectionBorders(this, 'top');
                if(hasBorder) {
                  label = markSelected(label);
                }

                return label;
              },
              callback: function () {
                var hasBorder = checkSelectionBorders(this, 'top');
                prepareBorder.call(this, this.getSelectedRange(), 'top', hasBorder);
              },
              disabled: false
            },
            right: {
              name: function () {
                var label = 'Right';
                var hasBorder = checkSelectionBorders(this, 'right');
                if(hasBorder) {
                  label = markSelected(label);
                }
                return label;
              },
              callback: function () {
                var hasBorder = checkSelectionBorders(this, 'right');
                prepareBorder.call(this, this.getSelectedRange(), 'right', hasBorder);
              },
              disabled: false
            },
            bottom: {
              name: function () {
                var label = 'Bottom';
                var hasBorder = checkSelectionBorders(this, 'bottom');
                if(hasBorder) {
                  label = markSelected(label);
                }
                return label;
              },
              callback: function () {
                var hasBorder = checkSelectionBorders(this, 'bottom');
                prepareBorder.call(this, this.getSelectedRange(), 'bottom', hasBorder);
              },
              disabled: false
            },
            left: {
              name: function () {
                var label = 'Left';
                var hasBorder = checkSelectionBorders(this, 'left');
                if(hasBorder) {
                  label = markSelected(label);
                }

                return label;
              },
              callback: function () {
                var hasBorder = checkSelectionBorders(this, 'left');
                prepareBorder.call(this, this.getSelectedRange(), 'left', hasBorder);
              },
              disabled: false
            },
            remove: {
              name: 'Remove border(s)',
              callback: function () {
                prepareBorder.call(this, this.getSelectedRange(), 'noBorders');
              },
              disabled: function () {
                return !checkSelectionBorders(this);
              }
            }
          }
        }
      });
    };

    Handsontable.hooks.add('beforeInit', init);
    Handsontable.hooks.add('afterContextMenuDefaultOptions', addBordersOptionsToContextMenu);


    Handsontable.hooks.add('afterInit', function () {
      var customBorders = this.getSettings().customBorders;

      if (customBorders){

        for(var i = 0; i< customBorders.length; i++) {
          if(customBorders[i].range){
            prepareBorderFromCustomAddedRange.call(this,customBorders[i]);
          } else {
            prepareBorderFromCustomAdded.call(this,customBorders[i].row, customBorders[i].col, customBorders[i]);
          }
        }

        this.render();
        this.view.wt.draw(true);
      }

    });

    Handsontable.CustomBorders = CustomBorders;

  }());

  /**
   * HandsontableManualRowMove
   *
   * Has 2 UI components:
   * - handle - the draggable element that sets the desired position of the row
   * - guide - the helper guide that shows the desired position as a horizontal guide
   *
   * Warning! Whenever you make a change in this file, make an analogous change in manualRowMove.js
   * @constructor
   */
  (function (Handsontable) {
    function HandsontableManualRowMove() {

      var startRow,
          endRow,
          startY,
          startOffset,
          currentRow,
          currentTH,
          handle = document.createElement('DIV'),
          guide = document.createElement('DIV'),
          eventManager = Handsontable.eventManager(this);

      handle.className = 'manualRowMover';
      guide.className = 'manualRowMoverGuide';

      var saveManualRowPositions = function () {
        var instance = this;
        Handsontable.hooks.run(instance, 'persistentStateSave', 'manualRowPositions', instance.manualRowPositions);
      };

      var loadManualRowPositions = function () {
        var instance = this,
            storedState = {};
        Handsontable.hooks.run(instance, 'persistentStateLoad', 'manualRowPositions', storedState);
        return storedState.value;
      };

      function setupHandlePosition(TH) {
        instance = this;
        currentTH = TH;

        var row = this.view.wt.wtTable.getCoords(TH).row; //getCoords returns WalkontableCellCoords
        if (row >= 0) { //if not row header
          currentRow = row;
          var box = currentTH.getBoundingClientRect();
          startOffset = box.top;
          handle.style.top = startOffset + 'px';
          handle.style.left = box.left + 'px';
          instance.rootElement.appendChild(handle);
        }
      }

      function refreshHandlePosition(TH, delta) {
        var box = TH.getBoundingClientRect();
        var handleHeight = 6;
        if (delta > 0) {
          handle.style.top = (box.top + box.height - handleHeight) + 'px';
        }
        else {
          handle.style.top = box.top + 'px';
        }
      }

      function setupGuidePosition() {
        var instance = this;
        Handsontable.Dom.addClass(handle, 'active');
        Handsontable.Dom.addClass(guide, 'active');
        var box = currentTH.getBoundingClientRect();
        guide.style.width = instance.view.maximumVisibleElementWidth(0) + 'px';
        guide.style.height = box.height + 'px';
        guide.style.top = startOffset + 'px';
        guide.style.left = handle.style.left;
        instance.rootElement.appendChild(guide);
      }

      function refreshGuidePosition(diff) {
        guide.style.top = startOffset + diff + 'px';
      }

      function hideHandleAndGuide() {
        Handsontable.Dom.removeClass(handle, 'active');
        Handsontable.Dom.removeClass(guide, 'active');
      }

      var checkRowHeader = function (element) {
        if (element.tagName != 'BODY') {
          if (element.parentNode.tagName == 'TBODY') {
            return true;
          } else {
            element = element.parentNode;
            return checkRowHeader(element);
          }
        }
        return false;
      };

      var getTHFromTargetElement = function (element) {
        if (element.tagName != 'TABLE') {
          if (element.tagName == 'TH') {
            return element;
          } else {
            return getTHFromTargetElement(element.parentNode);
          }
        }
        return null;
      };

      var bindEvents = function () {
        var instance = this;
        var pressed;


        eventManager.addEventListener(instance.rootElement, 'mouseover', function (e) {
          if (checkRowHeader(e.target)) {
            var th = getTHFromTargetElement(e.target);
            if (th) {
              if (pressed) {
                endRow = instance.view.wt.wtTable.getCoords(th).row;
                refreshHandlePosition(th, endRow - startRow);
              }
              else {
                setupHandlePosition.call(instance, th);
              }
            }
          }
        });

        eventManager.addEventListener(instance.rootElement, 'mousedown', function (e) {
          if (Handsontable.Dom.hasClass(e.target, 'manualRowMover')) {
            startY = Handsontable.helper.pageY(e);
            setupGuidePosition.call(instance);
            pressed = instance;

            startRow = currentRow;
            endRow = currentRow;
          }
        });

        eventManager.addEventListener(window, 'mousemove', function (e) {
          if (pressed) {
            refreshGuidePosition(Handsontable.helper.pageY(e) - startY);
          }
        });

        eventManager.addEventListener(window, 'mouseup', function (e) {
          if (pressed) {
            hideHandleAndGuide();
            pressed = false;

            createPositionData(instance.manualRowPositions, instance.countRows());
            instance.manualRowPositions.splice(endRow, 0, instance.manualRowPositions.splice(startRow, 1)[0]);

            instance.forceFullRender = true;
            instance.view.render(); //updates all

            saveManualRowPositions.call(instance);

            Handsontable.hooks.run(instance, 'afterRowMove', startRow, endRow);

            setupHandlePosition.call(instance, currentTH);
          }
        });

        instance.addHook('afterDestroy', unbindEvents);
      };

      var unbindEvents = function () {
        eventManager.clear();
      };

      var createPositionData = function (positionArr, len) {
        if (positionArr.length < len) {
          for (var i = positionArr.length; i < len; i++) {
            positionArr[i] = i;
          }
        }
      };

      this.beforeInit = function () {
        this.manualRowPositions = [];
      };

      this.init = function (source) {
        var instance = this;
        var manualRowMoveEnabled = !!(instance.getSettings().manualRowMove);

        if (manualRowMoveEnabled) {
          var initialManualRowPositions = instance.getSettings().manualRowMove;
          var loadedManualRowPostions = loadManualRowPositions.call(instance);

          // update plugin usages count for manualColumnPositions
          if (typeof instance.manualRowPositionsPluginUsages != 'undefined') {
            instance.manualRowPositionsPluginUsages.push('manualColumnMove');
          } else {
            instance.manualRowPositionsPluginUsages = ['manualColumnMove'];
          }

          if (typeof loadedManualRowPostions != 'undefined') {
            this.manualRowPositions = loadedManualRowPostions;
          } else if (Array.isArray(initialManualRowPositions)) {
            this.manualRowPositions = initialManualRowPositions;
          } else {
            this.manualRowPositions = [];
          }

          if (source === 'afterInit') {
            bindEvents.call(this);
            if (this.manualRowPositions.length > 0) {
              instance.forceFullRender = true;
              instance.render();
            }
          }
        } else {
          var pluginUsagesIndex = instance.manualRowPositionsPluginUsages ? instance.manualRowPositionsPluginUsages.indexOf('manualColumnMove') : -1;
          if (pluginUsagesIndex > -1) {
            unbindEvents.call(this);
            instance.manualRowPositions = [];
            instance.manualRowPositionsPluginUsages[pluginUsagesIndex] = void 0;
          }
        }

      };

      this.modifyRow = function (row) {
        var instance = this;
        if (instance.getSettings().manualRowMove) {
          if (typeof instance.manualRowPositions[row] === 'undefined') {
            createPositionData(this.manualRowPositions, row + 1);
          }
          return instance.manualRowPositions[row];
        }

        return row;
      };
    }

    var htManualRowMove = new HandsontableManualRowMove();

    Handsontable.hooks.add('beforeInit', htManualRowMove.beforeInit);
    Handsontable.hooks.add('afterInit', function () {
      htManualRowMove.init.call(this, 'afterInit');
    });

    Handsontable.hooks.add('afterUpdateSettings', function () {
      htManualRowMove.init.call(this, 'afterUpdateSettings');
    });

    Handsontable.hooks.add('modifyRow', htManualRowMove.modifyRow);
    Handsontable.hooks.register('afterRowMove');

  })(Handsontable);

  /**
   * This plugin provides "drag-down" and "copy-down" functionalities, both operated
   * using the small square in the right bottom of the cell selection.
   *
   * "Drag-down" expands the value of the selected cells to the neighbouring
   * cells when you drag the small square in the corner.
   *
   * "Copy-down" copies the value of the selection to all empty cells
   * below when you double click the small square.
   *
   * @plugin
   * @class Handsontable.Autofill
   */
  (function (Handsontable) {
    'use strict';

    function getDeltas(start, end, data, direction) {
      var
      // rows
          rlength = data.length,
      // cols
          clength = data ? data[0].length : 0,
          deltas = [],
          arr = [],
          diffRow, diffCol,
          startValue, endValue,
          delta;

      diffRow = end.row - start.row;
      diffCol = end.col - start.col;

      if (['down', 'up'].indexOf(direction) !== -1) {
        for (var col = 0; col <= diffCol; col ++) {
          startValue = parseInt(data[0][col], 10);
          endValue = parseInt(data[rlength - 1][col], 10);
          delta = (direction === 'down' ? (endValue - startValue) : (startValue - endValue))  / (rlength - 1) || 0;

          arr.push(delta);
        }
        deltas.push(arr);
      }

      if (['right', 'left'].indexOf(direction) !== -1) {
        for (var row = 0; row <= diffRow; row ++) {
          startValue = parseInt(data[row][0], 10);
          endValue = parseInt(data[row][clength - 1], 10);
          delta = (direction === 'right' ? (endValue - startValue) : (startValue - endValue)) / (clength - 1) || 0;

          arr = [];
          arr.push(delta);

          deltas.push(arr);
        }
      }

      return deltas;
    }

    /**
     * @param instance
     * @constructor
     */
    function Autofill(instance) {
      var
          _this = this,
          mouseDownOnCellCorner = false,
          wtOnCellCornerMouseDown,
          wtOnCellMouseOver,
          eventManager;

      this.instance = instance;
      this.addingStarted = false;

      eventManager = Handsontable.eventManager(instance);

      function mouseUpCallback(event) {
        if (!instance.autofill) {
          return true;
        }

        if (instance.autofill.handle && instance.autofill.handle.isDragged) {
          if (instance.autofill.handle.isDragged > 1) {
            instance.autofill.apply();
          }
          instance.autofill.handle.isDragged = 0;
          mouseDownOnCellCorner = false;
        }
      }
      function mouseMoveCallback(event) {
        var tableBottom, tableRight;

        if (!_this.instance.autofill) {
          return false;
        }
        tableBottom = Handsontable.Dom.offset(_this.instance.table).top -
            (window.pageYOffset || document.documentElement.scrollTop) + Handsontable.Dom.outerHeight(_this.instance.table);
        tableRight = Handsontable.Dom.offset(_this.instance.table).left -
            (window.pageXOffset || document.documentElement.scrollLeft) + Handsontable.Dom.outerWidth(_this.instance.table);

        // dragged outside bottom
        if (_this.addingStarted === false && _this.instance.autofill.handle.isDragged > 0 &&
            event.clientY > tableBottom && event.clientX <= tableRight) {
          _this.instance.mouseDragOutside = true;
          _this.addingStarted = true;

        } else {
          _this.instance.mouseDragOutside = false;
        }

        if (_this.instance.mouseDragOutside) {
          setTimeout(function () {
            _this.addingStarted = false;
            _this.instance.alter('insert_row');
          }, 200);
        }
      }
      eventManager.addEventListener(document, 'mouseup', mouseUpCallback);
      eventManager.addEventListener(document, 'mousemove', mouseMoveCallback);

      /**
       * Appeding autofill-specific methods to walkontable event settings
       */
      wtOnCellCornerMouseDown = this.instance.view.wt.wtSettings.settings.onCellCornerMouseDown;

      this.instance.view.wt.wtSettings.settings.onCellCornerMouseDown = function(event) {
        instance.autofill.handle.isDragged = 1;
        mouseDownOnCellCorner = true;
        wtOnCellCornerMouseDown(event);
      };

      wtOnCellMouseOver = this.instance.view.wt.wtSettings.settings.onCellMouseOver;

      this.instance.view.wt.wtSettings.settings.onCellMouseOver = function(event, coords, TD, wt) {
        if (instance.autofill && mouseDownOnCellCorner && !instance.view.isMouseDown() &&
            instance.autofill.handle && instance.autofill.handle.isDragged) {
          instance.autofill.handle.isDragged ++;
          instance.autofill.showBorder(coords);
          instance.autofill.checkIfNewRowNeeded();
        }
        wtOnCellMouseOver(event, coords, TD, wt);
      };

      this.instance.view.wt.wtSettings.settings.onCellCornerDblClick = function() {
        instance.autofill.selectAdjacent();
      };
    }

    /**
     * Create fill handle and fill border objects
     *
     * @function init
     * @memberof Handsontable.Autofill#
     */
    Autofill.prototype.init = function () {
      this.handle = {};
    };

    /**
     * Hide fill handle and fill border permanently
     *
     * @function disable
     * @memberof Handsontable.Autofill#
     */
    Autofill.prototype.disable = function () {
      this.handle.disabled = true;
    };

    /**
     * Selects cells down to the last row in the left column, then fills down to that cell
     *
     * @function selectAdjacent
     * @memberof Handsontable.Autofill#
     */
    Autofill.prototype.selectAdjacent = function () {
      var select, data, r, maxR, c;

      if (this.instance.selection.isMultiple()) {
        select = this.instance.view.wt.selections.area.getCorners();

      } else {
        select = this.instance.view.wt.selections.current.getCorners();
      }
      data = this.instance.getData();

      rows : for (r = select[2] + 1; r < this.instance.countRows(); r ++) {
        for (c = select[1]; c <= select[3]; c ++) {
          if (data[r][c]) {
            break rows;
          }
        }
        if (!!data[r][select[1] - 1] || !!data[r][select[3] + 1]) {
          maxR = r;
        }
      }
      if (maxR) {
        this.instance.view.wt.selections.fill.clear();
        this.instance.view.wt.selections.fill.add(new WalkontableCellCoords(select[0], select[1]));
        this.instance.view.wt.selections.fill.add(new WalkontableCellCoords(maxR, select[3]));
        this.apply();
      }
    };

    /**
     * Apply fill values to the area in fill border, omitting the selection border
     *
     * @function apply
     * @memberof Handsontable.Autofill#
     */
    Autofill.prototype.apply = function () {
      var drag, select, start, end, _data, direction, deltas, selRange;

      this.handle.isDragged = 0;
      drag = this.instance.view.wt.selections.fill.getCorners();

      if (!drag) {
        return;
      }
      this.instance.view.wt.selections.fill.clear();

      if (this.instance.selection.isMultiple()) {
        select = this.instance.view.wt.selections.area.getCorners();
      }  else {
        select = this.instance.view.wt.selections.current.getCorners();
      }

      if (drag[0] === select[0] && drag[1] < select[1]) {
        direction = 'left';

        start = new WalkontableCellCoords(drag[0], drag[1]);
        end = new WalkontableCellCoords(drag[2], select[1] - 1);

      } else if (drag[0] === select[0] && drag[3] > select[3]) {
        direction = 'right';

        start = new WalkontableCellCoords(drag[0], select[3] + 1);
        end = new WalkontableCellCoords(drag[2], drag[3]);

      } else if (drag[0] < select[0] && drag[1] === select[1]) {
        direction = 'up';

        start = new WalkontableCellCoords(drag[0], drag[1]);
        end = new WalkontableCellCoords(select[0] - 1, drag[3]);

      } else if (drag[2] > select[2] && drag[1] === select[1]) {
        direction = 'down';

        start = new WalkontableCellCoords(select[2] + 1, drag[1]);
        end = new WalkontableCellCoords(drag[2], drag[3]);
      }

      if (start && start.row > -1 && start.col > -1) {
        selRange = {
          from: this.instance.getSelectedRange().from,
          to: this.instance.getSelectedRange().to
        };
        _data = this.instance.getData(selRange.from.row, selRange.from.col, selRange.to.row, selRange.to.col);
        deltas = getDeltas(start, end, _data, direction);

        Handsontable.hooks.run(this.instance, 'beforeAutofill', start, end, _data);
        this.instance.populateFromArray(start.row, start.col, _data, end.row, end.col, 'autofill', null, direction, deltas);

        this.instance.selection.setRangeStart(new WalkontableCellCoords(drag[0], drag[1]));
        this.instance.selection.setRangeEnd(new WalkontableCellCoords(drag[2], drag[3]));

      } else {
        // reset to avoid some range bug
        this.instance.selection.refreshBorders();
      }
    };

    /**
     * Show fill border
     *
     * @function showBorder
     * @memberof Handsontable.Autofill#
     * @param {WalkontableCellCoords} coords
     */
    Autofill.prototype.showBorder = function(coords) {
      var topLeft = this.instance.getSelectedRange().getTopLeftCorner(),
          bottomRight = this.instance.getSelectedRange().getBottomRightCorner();

      if (this.instance.getSettings().fillHandle !== 'horizontal' && (bottomRight.row < coords.row || topLeft.row > coords.row)) {
        coords = new WalkontableCellCoords(coords.row, bottomRight.col);

      } else if (this.instance.getSettings().fillHandle !== 'vertical') {
        coords = new WalkontableCellCoords(bottomRight.row, coords.col);

      } else {
        // wrong direction
        return;
      }
      this.instance.view.wt.selections.fill.clear();
      this.instance.view.wt.selections.fill.add(this.instance.getSelectedRange().from);
      this.instance.view.wt.selections.fill.add(this.instance.getSelectedRange().to);
      this.instance.view.wt.selections.fill.add(coords);
      this.instance.view.render();
    };

    /**
     * @function checkIfNewRowNeeded
     * @memberof Handsontable.Autofill#
     */
    Autofill.prototype.checkIfNewRowNeeded = function() {
      var fillCorners,
          selection,
          tableRows = this.instance.countRows(),
          that = this;

      if (this.instance.view.wt.selections.fill.cellRange && this.addingStarted === false) {
        selection = this.instance.getSelected();
        fillCorners = this.instance.view.wt.selections.fill.getCorners();

        if (selection[2] < tableRows - 1 && fillCorners[2] === tableRows - 1) {
          this.addingStarted = true;

          this.instance._registerTimeout(setTimeout(function () {
            that.instance.alter('insert_row');
            that.addingStarted = false;
          }, 200));
        }
      }
    };


    Handsontable.hooks.add('afterInit', function() {
      var autofill = new Autofill(this);

      if (typeof this.getSettings().fillHandle !== 'undefined') {
        if (autofill.handle && this.getSettings().fillHandle === false) {
          autofill.disable();

        } else if (!autofill.handle && this.getSettings().fillHandle !== false) {
          /**
           * Instance of Autofill Plugin {@link Handsontable.Autofill}
           * @alias autofill
           * @memberof! Handsontable.Core#
           * @type {Autofill}
           */
          this.autofill = autofill;
          this.autofill.init();
        }
      }
    });
    Handsontable.Autofill = Autofill;

  })(Handsontable);

  var Grouping = function (instance) {
    /**
     * array of items
     * @type {Array}
     */
    var groups = [];

    /**
     * group definition
     * @type {{id: String, level: Number, rows: Array, cols: Array, hidden: Number}}
     */
    var item = {
      id: '',
      level: 0,
      hidden: 0,
      rows: [],
      cols: []
    };

    /**
     * total rows and cols merged in groups
     * @type {{rows: number, cols: number}}
     */
    var counters = {
      rows: 0,
      cols: 0
    };

    /**
     * Number of group levels in each dimension
     * @type {{rows: number, cols: number}}
     */
    var levels = {
      rows: 0,
      cols: 0
    };

    /**
     * List of hidden rows
     * @type {Array}
     */
    var hiddenRows = [];

    /**
     * List of hidden columns
     * @type {Array}
     */
    var hiddenCols = [];

    /**
     * Classes used
     */
    var classes = {
      'groupIndicatorContainer': 'htGroupIndicatorContainer',
      'groupIndicator': function (direction) {
        return 'ht' + direction + 'Group';
      },
      'groupStart': 'htGroupStart',
      'collapseButton': 'htCollapseButton',
      'expandButton': 'htExpandButton',
      'collapseGroupId': function (id) {
        return 'htCollapse-' + id;
      },
      'collapseFromLevel': function (direction, level) {
        return 'htCollapse' + direction + 'FromLevel-' + level;
      },
      'clickable': 'clickable',
      'levelTrigger': 'htGroupLevelTrigger'
    };

    /**
     * compare object properties
     * @param {String} property
     * @param {String} orderDirection
     * @returns {Function}
     */
    var compare = function (property, orderDirection) {
      return function (item1, item2) {
        return typeof (orderDirection) === 'undefined' || orderDirection === 'asc' ? item1[property] - item2[property] : item2[property] - item1[property];
      };
    };

    /**
     * Create range array between from and to
     * @param {Number} from
     * @param {Number} to
     * @returns {Array}
     */
    var range = function (from, to) {
      var arr = [];
      while (from <= to) {
        arr.push(from++);
      }

      return arr;
    };

    /**
     * * Get groups for range
     * @param from
     * @param to
     * @returns {{total: {rows: number, cols: number}, groups: Array}}
     */
    var getRangeGroups = function (dataType, from, to) {
      var cells = [],
          cell = {
            row: null,
            col: null
          };

      if (dataType == "cols") {
        // get all rows for selected columns
        while (from <= to) {
          cell = {
            row: -1,
            col: from++
          };
          cells.push(cell);
        }

      } else {
        // get all columns for selected rows
        while (from <= to) {
          cell = {
            row: from++,
            col: -1
          };
          cells.push(cell);
        }
      }

      var cellsGroups = getCellsGroups(cells),
          totalRows = 0,
          totalCols = 0;

      // for selected cells, calculate total groups divided into rows and columns
      for (var i = 0; i < cellsGroups.length; i++) {
        totalRows += cellsGroups[i].filter(function (item) {
          return item['rows'];
        }).length;

        totalCols += cellsGroups[i].filter(function (item) {
          return item['cols'];
        }).length;
      }

      return {
        total: {
          rows: totalRows,
          cols: totalCols
        },
        groups: cellsGroups
      };
    };

    /**
     * Get all groups for cells
     * @param {Array} cells [{row:0, col:0}, {row:0, col:1}, {row:1, col:2}]
     * @returns {Array}
     */
    var getCellsGroups = function (cells) {
      var _groups = [];

      for (var i = 0; i < cells.length; i++) {
        _groups.push(getCellGroups(cells[i]));
      }

      return _groups;
    };

    /**
     * Get all groups for cell
     * @param {Object} coords {row:1, col:2}
     * @param {Number} groupLevel Optional
     * @param {String} groupType Optional
     * @returns {Array}
     */
    var getCellGroups = function (coords, groupLevel, groupType) {
      var row = coords.row,
          col = coords.col;

      // for row = -1 and col = -1, get all columns and rows
      var tmpRow = (row === -1 ? 0 : row),
          tmpCol = (col === -1 ? 0 : col);

      var _groups = [];

      for (var i = 0; i < groups.length; i++) {
        var group = groups[i],
            id = group['id'],
            level = group['level'],
            rows = group['rows'] || [],
            cols = group['cols'] || [];

        if (_groups.indexOf(id) === -1) {
          if (rows.indexOf(tmpRow) !== -1 || cols.indexOf(tmpCol) !== -1) {
            _groups.push(group);
          }
        }
      }

      // add col groups
      if (col === -1) {
        _groups = _groups.concat(getColGroups());
      } else if (row === -1) {
        // add row groups
        _groups = _groups.concat(getRowGroups());
      }

      if (groupLevel) {
        _groups = _groups.filter(function (item) {
          return item['level'] === groupLevel;
        });
      }

      if (groupType) {
        if (groupType === 'cols') {
          _groups = _groups.filter(function (item) {
            return item['cols'];
          });
        } else if (groupType === 'rows') {
          _groups = _groups.filter(function (item) {
            return item['rows'];
          });
        }
      }

      // remove duplicates
      var tmp = [];
      return _groups.filter(function (item) {
        if (tmp.indexOf(item.id) === -1) {
          tmp.push(item.id);
          return item;
        }
      });
    };

    /**
     * get group by id
     * @param id
     * @returns {Object} group
     */
    var getGroupById = function (id) {
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (groups[i].id == id) {
          return groups[i];
        }
      }
      return false;
    };

    /**
     * get group by row and level
     * @param row
     * @param level
     * @returns {Object} group
     */
    var getGroupByRowAndLevel = function (row, level) {
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (groups[i].level == level && groups[i].rows && groups[i].rows.indexOf(row) > -1) {
          return groups[i];
        }
      }
      return false;
    };

    /**
     * get group by row and level
     * @param row
     * @param level
     * @returns {Object} group
     */
    var getGroupByColAndLevel = function (col, level) {
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (groups[i].level == level && groups[i].cols && groups[i].cols.indexOf(col) > -1) {
          return groups[i];
        }
      }
      return false;
    };

    /**
     * get total column groups
     * @returns {*|Array}
     */
    var getColGroups = function () {
      var result = [];
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (Array.isArray(groups[i]['cols'])) {
          result.push(groups[i]);
        }
      }
      return result;
    };

    /**
     * get total col groups by level
     * @param {Number} level
     * @returns {*|Array}
     */
    var getColGroupsByLevel = function (level) {
      var result = [];
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (groups[i]['cols'] && groups[i]['level'] === level) {
          result.push(groups[i]);
        }
      }
      return result;
    };

    /**
     * get total row groups
     * @returns {*|Array}
     */
    var getRowGroups = function () {
      var result = [];
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (Array.isArray(groups[i]['rows'])) {
          result.push(groups[i]);
        }
      }
      return result;
    };

    /**
     * get total row groups by level
     * @param {Number} level
     * @returns {*|Array}
     */
    var getRowGroupsByLevel = function (level) {
      var result = [];
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        if (groups[i]['rows'] && groups[i]['level'] === level) {
          result.push(groups[i]);
        }
      }
      return result;
    };

    /**
     * get last inserted range level in columns
     * @param {Array} rangeGroups
     * @returns {number}
     */
    var getLastLevelColsInRange = function (rangeGroups) {
      var level = 0;

      if (rangeGroups.length) {
        rangeGroups.forEach(function (items) {
          items = items.filter(function (item) {
            return item['cols'];
          });

          if (items.length) {
            var sortedGroup = items.sort(compare('level', 'desc')),
                lastLevel = sortedGroup[0].level;

            if (level < lastLevel) {
              level = lastLevel;
            }
          }
        });
      }

      return level;
    };

    /**
     * get last inserted range level in rows
     * @param {Array} rangeGroups
     * @returns {number}
     */
    var getLastLevelRowsInRange = function (rangeGroups) {
      var level = 0;

      if (rangeGroups.length) {
        rangeGroups.forEach(function (items) {
          items = items.filter(function (item) {
            return item['rows'];
          });

          if (items.length) {
            var sortedGroup = items.sort(compare('level', 'desc')),
                lastLevel = sortedGroup[0].level;

            if (level < lastLevel) {
              level = lastLevel;
            }
          }
        });
      }

      return level;
    };

    /**
     * create group for cols
     * @param {Number} from
     * @param {Number} to
     */
    var groupCols = function (from, to) {
      var rangeGroups = getRangeGroups("cols", from, to),
          lastLevel = getLastLevelColsInRange(rangeGroups.groups);

      if (lastLevel === levels.cols) {
        levels.cols++;
      } else if (lastLevel > levels.cols) {
        levels.cols = lastLevel + 1;
      }

      if (!counters.cols) {
        counters.cols = getColGroups().length;
      }

      counters.cols++;
      groups.push({
        id: 'c' + counters.cols,
        level: lastLevel + 1,
        cols: range(from, to),
        hidden: 0
      });
    };

    /**
     * create group for rows
     * @param {Number} from
     * @param {Number} to
     */
    var groupRows = function (from, to) {
      var rangeGroups = getRangeGroups("rows", from, to),
          lastLevel = getLastLevelRowsInRange(rangeGroups.groups);

      levels.rows = Math.max(levels.rows, lastLevel + 1);


      if (!counters.rows) {
        counters.rows = getRowGroups().length;
      }

      counters.rows++;
      groups.push({
        id: 'r' + counters.rows,
        level: lastLevel + 1,
        rows: range(from, to),
        hidden: 0
      });
    };

    /**
     * show or hide groups
     * @param showHide
     * @param groups
     */
    var showHideGroups = function (hidden, groups) {
      var level;
      for (var i = 0, groupsLength = groups.length; i < groupsLength; i++) {
        groups[i].hidden = hidden;
        level = groups[i].level;

        if (!hiddenRows[level]) {
          hiddenRows[level] = [];
        }
        if (!hiddenCols[level]) {
          hiddenCols[level] = [];
        }

        if (groups[i].rows) {
          for (var j = 0, rowsLength = groups[i].rows.length; j < rowsLength; j++) {
            if (hidden > 0) {
              hiddenRows[level][groups[i].rows[j]] = true;
            } else {
              hiddenRows[level][groups[i].rows[j]] = void 0;
            }
          }
        } else if (groups[i].cols) {
          for (var j = 0, colsLength = groups[i].cols.length; j < colsLength; j++) {
            if (hidden > 0) {
              hiddenCols[level][groups[i].cols[j]] = true;
            } else {
              hiddenCols[level][groups[i].cols[j]] = void 0;
            }
          }
        }
      }
    };

    /**
     * Check if the next cell of the dimension (row / column) contains a group at the same level
     * @param dimension
     * @param currentPosition
     * @param level
     * @param currentGroupId
     * @returns {boolean}
     */
    var nextIndexSharesLevel = function (dimension, currentPosition, level, currentGroupId) {
      var nextCellGroupId
          , levelsByOrder;

      switch (dimension) {
        case 'rows':
          nextCellGroupId = getGroupByRowAndLevel(currentPosition + 1, level).id;
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByRows();
          break;
        case 'cols':
          nextCellGroupId = getGroupByColAndLevel(currentPosition + 1, level).id;
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByCols();
          break;
      }

      return !!(levelsByOrder[currentPosition + 1] && levelsByOrder[currentPosition + 1].indexOf(level) > -1 && currentGroupId == nextCellGroupId);

    };

    /**
     * Check if the previous cell of the dimension (row / column) contains a group at the same level
     * @param dimension
     * @param currentPosition
     * @param level
     * @param currentGroupId
     * @returns {boolean}
     */
    var previousIndexSharesLevel = function (dimension, currentPosition, level, currentGroupId) {
      var previousCellGroupId
          , levelsByOrder;

      switch (dimension) {
        case 'rows':
          previousCellGroupId = getGroupByRowAndLevel(currentPosition - 1, level).id;
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByRows();
          break;
        case 'cols':
          previousCellGroupId = getGroupByColAndLevel(currentPosition - 1, level).id;
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByCols();
          break;
      }

      return !!(levelsByOrder[currentPosition - 1] && levelsByOrder[currentPosition - 1].indexOf(level) > -1 && currentGroupId == previousCellGroupId);

    };

    /**
     * Check if the provided index is at the end of the group indicator line
     * @param dimension
     * @param index
     * @param level
     * @param currentGroupId
     * @returns {boolean}
     */
    var isLastIndexOfTheLine = function (dimension, index, level, currentGroupId) {
      if (index === 0) {
        return false;
      }
      var levelsByOrder
          , entriesLength
          , previousSharesLevel = previousIndexSharesLevel(dimension, index, level, currentGroupId)
          , nextSharesLevel = nextIndexSharesLevel(dimension, index, level, currentGroupId)
          , nextIsHidden = false;

      switch (dimension) {
        case 'rows':
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByRows();
          entriesLength = instance.countRows();
          for (var i = 0; i <= levels.rows; i++) {
            if (hiddenRows[i] && hiddenRows[i][index + 1]) {
              nextIsHidden = true;
              break;
            }
          }
          break;
        case 'cols':
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByCols();
          entriesLength = instance.countCols();
          for (var i = 0; i <= levels.cols; i++) {
            if (hiddenCols[i] && hiddenCols[i][index + 1]) {
              nextIsHidden = true;
              break;
            }
          }
          break;
      }

      if (previousSharesLevel) {
        if (index == entriesLength - 1) {
          return true;
        } else if (!nextSharesLevel || (nextSharesLevel && nextIsHidden)) {
          return true;
        } else if (!levelsByOrder[index + 1]) {
          return true;
        }
      }
      return false;
    };

    /**
     * Check if all rows/cols are hidden
     * @param dataType
     */
    var isLastHidden = function (dataType) {
      var levelAmount;

      switch (dataType) {
        case 'rows':
          levelAmount = levels.rows;
          for (var j = 0; j <= levelAmount; j++) {
            if (hiddenRows[j] && hiddenRows[j][instance.countRows() - 1]) {
              return true;
            }
          }

          break;
        case 'cols':
          levelAmount = levels.cols;
          for (var j = 0; j <= levelAmount; j++) {
            if (hiddenCols[j] && hiddenCols[j][instance.countCols() - 1]) {
              return true;
            }
          }
          break;
      }

      return false;
    };

    /**
     * Check if the provided index is at the beginning of the group indicator line
     * @param dimension
     * @param index
     * @param level
     * @param currentGroupId
     * @returns {boolean}
     */
    var isFirstIndexOfTheLine = function (dimension, index, level, currentGroupId) {
      var levelsByOrder
          , entriesLength
          , currentGroup = getGroupById(currentGroupId)
          , previousAreHidden = false
          , arePreviousHidden = function (dimension) {
            var hidden = false
                , hiddenArr = dimension == 'rows' ? hiddenRows : hiddenCols;
            for (var i = 0; i <= levels[dimension]; i++) {
              tempInd = index;
              while (currentGroup[dimension].indexOf(tempInd) > -1) {
                hidden = !!(hiddenArr[i] && hiddenArr[i][tempInd]);
                tempInd--;
              }
              if (hidden) {
                break;
              }
            }
            return hidden;
          }
          , previousSharesLevel = previousIndexSharesLevel(dimension, index, level, currentGroupId)
          , nextSharesLevel = nextIndexSharesLevel(dimension, index, level, currentGroupId)
          , tempInd;

      switch (dimension) {
        case 'rows':
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByRows();
          entriesLength = instance.countRows();
          previousAreHidden = arePreviousHidden(dimension);
          break;
        case 'cols':
          levelsByOrder = Handsontable.Grouping.getGroupLevelsByCols();
          entriesLength = instance.countCols();
          previousAreHidden = arePreviousHidden(dimension);
          break;
      }

      if (index == entriesLength - 1) {
        return false;
      }
      else if (index === 0) {
        if (nextSharesLevel) {
          return true;
        }
      } else if (!previousSharesLevel || (previousSharesLevel && previousAreHidden)) {
        if (nextSharesLevel) {
          return true;
        }
      } else if (!levelsByOrder[index - 1]) {
        if (nextSharesLevel) {
          return true;
        }
      }
      return false;
    };

    /**
     * Add group expander button
     * @param dimension
     * @param index
     * @param level
     * @param id
     * @param elem
     * @returns {*}
     */
    var addGroupExpander = function (dataType, index, level, id, elem) {
      var previousIndexGroupId;

      switch (dataType) {
        case 'rows':
          previousIndexGroupId = getGroupByRowAndLevel(index - 1, level).id;
          break;
        case 'cols':
          previousIndexGroupId = getGroupByColAndLevel(index - 1, level).id;
          break;
      }

      if (!previousIndexGroupId) {
        return null;
      }

      if (index > 0) {
        if (previousIndexSharesLevel(dataType, index - 1, level, previousIndexGroupId) && previousIndexGroupId != id) {

          var expanderButton = document.createElement('DIV');
          Handsontable.Dom.addClass(expanderButton, classes.expandButton);
          expanderButton.id = 'htExpand-' + previousIndexGroupId;
          expanderButton.appendChild(document.createTextNode('+'));
          expanderButton.setAttribute('data-level', level);
          expanderButton.setAttribute('data-type', dataType);
          expanderButton.setAttribute('data-hidden', "1");

          elem.appendChild(expanderButton);

          return expanderButton;
        }
      }
      return null;
    };

    /**
     * Check if provided cell is collapsed (either by rows or cols)
     * @param currentPosition
     * @returns {boolean}
     */
    var isCollapsed = function (currentPosition) {
      var rowGroups = getRowGroups()
          , colGroups = getColGroups();

      for (var i = 0, rowGroupsCount = rowGroups.length; i < rowGroupsCount; i++) {
        if (rowGroups[i].rows.indexOf(currentPosition.row) > -1 && rowGroups[i].hidden) {
          return true;
        }
      }

      if (currentPosition.col === null) { // if col is set to null, check only rows
        return false;
      }

      for (var i = 0, colGroupsCount = colGroups.length; i < colGroupsCount; i++) {
        if (colGroups[i].cols.indexOf(currentPosition.col) > -1 && colGroups[i].hidden) {
          return true;
        }
      }

      return false;
    };

    return {

      /**
       * all groups for ht instance
       */
      getGroups: function () {
        return groups;
      },
      /**
       * All levels for rows and cols respectively
       */
      getLevels: function () {
        return levels;
      },
      /**
       * Current instance
       */
      instance: instance,
      /**
       * Initial setting for minSpareRows
       */
      baseSpareRows: instance.getSettings().minSpareRows,
      /**
       * Initial setting for minSpareCols
       */
      baseSpareCols: instance.getSettings().minSpareCols,

      getRowGroups: getRowGroups,
      getColGroups: getColGroups,
      /**
       * init group
       * @param {Object} settings, could be an array of objects [{cols: [0,1,2]}, {cols: [3,4,5]}, {rows: [0,1]}]
       */
      init: function () {
        var groupsSetting = instance.getSettings().groups;
        if (groupsSetting) {
          if (Array.isArray(groupsSetting)) {
            Handsontable.Grouping.initGroups(groupsSetting);
          }
        }
      },

      /**
       * init groups from configuration on startup
       */
      initGroups: function (initialGroups) {
        var that = this;

        groups = [];

        initialGroups.forEach(function (item) {
          var _group = [],
              isRow = false,
              isCol = false;

          if (Array.isArray(item.rows)) {
            _group = item.rows;
            isRow = true;
          } else if (Array.isArray(item.cols)) {
            _group = item.cols;
            isCol = true;
          }

          var from = _group[0],
              to = _group[_group.length - 1];

          if (isRow) {
            groupRows(from, to);
          } else if (isCol) {
            groupCols(from, to);
          }
        });
//      this.render();
      },

      /**
       * Remove all existing groups
       */
      resetGroups: function () {
        groups = [];
        counters = {
          rows: 0,
          cols: 0
        };
        levels = {
          rows: 0,
          cols: 0
        };

        var allOccurrences;
        for (var i in classes) {
          if (typeof classes[i] != 'function') {
            allOccurrences = document.querySelectorAll('.' + classes[i]);
            for (var j = 0, occurrencesLength = allOccurrences.length; j < occurrencesLength; j++) {
              Handsontable.Dom.removeClass(allOccurrences[j], classes[i]);
            }
          }
        }

        var otherClasses = ['htGroupColClosest', 'htGroupCol'];
        for (var i = 0, otherClassesLength = otherClasses.length; i < otherClassesLength; i++) {
          allOccurrences = document.querySelectorAll('.' + otherClasses[i]);
          for (var j = 0, occurrencesLength = allOccurrences.length; j < occurrencesLength; j++) {
            Handsontable.Dom.removeClass(allOccurrences[j], otherClasses[i]);
          }
        }
      },
      /**
       * Update groups from the instance settings
       */
      updateGroups: function () {
        var groupSettings = this.getSettings().groups;

        Handsontable.Grouping.resetGroups();
        Handsontable.Grouping.initGroups(groupSettings);
      },
      afterGetRowHeader: function (row, TH) {
        var currentRowHidden = false;
        for (var i = 0, levels = hiddenRows.length; i < levels; i++) {
          if (hiddenRows[i] && hiddenRows[i][row] === true) {
            currentRowHidden = true;
          }
        }

        if (currentRowHidden) {
          Handsontable.Dom.addClass(TH.parentNode, 'hidden');
        } else if (!currentRowHidden && Handsontable.Dom.hasClass(TH.parentNode, 'hidden')) {
          Handsontable.Dom.removeClass(TH.parentNode, 'hidden');
        }

      },
      afterGetColHeader: function (col, TH) {
        var rowHeaders = this.view.wt.wtSettings.getSetting('rowHeaders').length
            , thisColgroup = instance.rootElement.querySelectorAll('colgroup col:nth-child(' + parseInt(col + rowHeaders + 1, 10) + ')');

        if (thisColgroup.length === 0) {
          return;
        }

        var currentColHidden = false;
        for (var i = 0, levels = hiddenCols.length; i < levels; i++) {
          if (hiddenCols[i] && hiddenCols[i][col] === true) {
            currentColHidden = true;
          }
        }

        if (currentColHidden) {
          for (var i = 0, colsAmount = thisColgroup.length; i < colsAmount; i++) {
            Handsontable.Dom.addClass(thisColgroup[i], 'hidden');
          }
        } else if (!currentColHidden && Handsontable.Dom.hasClass(thisColgroup[0], 'hidden')) {
          for (var i = 0, colsAmount = thisColgroup.length; i < colsAmount; i++) {
            Handsontable.Dom.removeClass(thisColgroup[i], 'hidden');
          }
        }
      },
      /**
       * Create a renderer for additional row/col headers, acting as group indicators
       * @param walkontableConfig
       * @param direction
       */
      groupIndicatorsFactory: function (renderersArr, direction) {
        var groupsLevelsList
            , getCurrentLevel
            , getCurrentGroupId
            , dataType
            , getGroupByIndexAndLevel
            , headersType
            , currentHeaderModifier
            , createLevelTriggers;

        switch (direction) {
          case 'horizontal':
            groupsLevelsList = Handsontable.Grouping.getGroupLevelsByCols();
            getCurrentLevel = function (elem) {
              return Array.prototype.indexOf.call(elem.parentNode.parentNode.childNodes, elem.parentNode) + 1;
            };
            getCurrentGroupId = function (col, level) {
              return getGroupByColAndLevel(col, level).id;
            };
            dataType = 'cols';
            getGroupByIndexAndLevel = function (col, level) {
              return getGroupByColAndLevel(col - 1, level);
            };
            headersType = "columnHeaders";
            currentHeaderModifier = function (headerRenderers) {
              if (headerRenderers.length === 1) {
                var oldFn = headerRenderers[0];

                headerRenderers[0] = function (index, elem, level) {

                  if (index < -1) {
                    makeGroupIndicatorsForLevel()(index, elem, level);
                  } else {
                    Handsontable.Dom.removeClass(elem, classes.groupIndicatorContainer);
                    oldFn(index, elem, level);
                  }
                };
              }
              return function () {
                return headerRenderers;
              };
            };
            createLevelTriggers = true;
            break;
          case 'vertical':
            groupsLevelsList = Handsontable.Grouping.getGroupLevelsByRows();
            getCurrentLevel = function (elem) {
              return Handsontable.Dom.index(elem) + 1;
            };
            getCurrentGroupId = function (row, level) {
              return getGroupByRowAndLevel(row, level).id;
            };
            dataType = 'rows';
            getGroupByIndexAndLevel = function (row, level) {
              return getGroupByRowAndLevel(row - 1, level);
            };
            headersType = "rowHeaders";
            currentHeaderModifier = function (headerRenderers) {
              return headerRenderers;
            };
            break;
        }

        var createButton = function (parent) {
          var button = document.createElement('div');

          parent.appendChild(button);

          return {
            button: button,
            addClass: function (className) {
              Handsontable.Dom.addClass(button, className);
            }
          };
        };

        var makeGroupIndicatorsForLevel = function () {
          var directionClassname = direction.charAt(0).toUpperCase() + direction.slice(1); // capitalize the first letter

          return function (index, elem, level) { // header rendering function

            level++;
            var child
                , collapseButton;

            /* jshint -W084 */
            while (child = elem.lastChild) {
              elem.removeChild(child);
            }

            Handsontable.Dom.addClass(elem, classes.groupIndicatorContainer);

            var currentGroupId = getCurrentGroupId(index, level);

            if (index > -1 && (groupsLevelsList[index] && groupsLevelsList[index].indexOf(level) > -1)) {

              collapseButton = createButton(elem);
              collapseButton.addClass(classes.groupIndicator(directionClassname));

              if (isFirstIndexOfTheLine(dataType, index, level, currentGroupId)) { // add a little thingy and the top of the group indicator
                collapseButton.addClass(classes.groupStart);
              }

              if (isLastIndexOfTheLine(dataType, index, level, currentGroupId)) { // add [+]/[-] button at the end of the line
                collapseButton.button.appendChild(document.createTextNode('-'));
                collapseButton.addClass(classes.collapseButton);
                collapseButton.button.id = classes.collapseGroupId(currentGroupId);
                collapseButton.button.setAttribute('data-level', level);
                collapseButton.button.setAttribute('data-type', dataType);
              }

            }

            if (createLevelTriggers) {
              var rowInd = Handsontable.Dom.index(elem.parentNode);
              if (index === -1 || (index < -1 && rowInd === Handsontable.Grouping.getLevels().cols + 1) ||
                  (rowInd === 0 && Handsontable.Grouping.getLevels().cols === 0)) {
                collapseButton = createButton(elem);
                collapseButton.addClass(classes.levelTrigger);

                if (index === -1) {
                  collapseButton.button.id = classes.collapseFromLevel("Cols", level);
                  collapseButton.button.appendChild(document.createTextNode(level));
                } else if (index < -1 && rowInd === Handsontable.Grouping.getLevels().cols + 1 ||
                    (rowInd === 0 && Handsontable.Grouping.getLevels().cols === 0)) {
                  var colInd = Handsontable.Dom.index(elem) + 1;
                  collapseButton.button.id = classes.collapseFromLevel("Rows", colInd);
                  collapseButton.button.appendChild(document.createTextNode(colInd));
                }
              }
            }

            // add group expending button
            var expanderButton = addGroupExpander(dataType, index, level, currentGroupId, elem);
            if (index > 0) {
              var previousGroupObj = getGroupByIndexAndLevel(index - 1, level);

              if (expanderButton && previousGroupObj.hidden) {
                Handsontable.Dom.addClass(expanderButton, classes.clickable);
              }
            }

            updateHeaderWidths();

          };
        };


        renderersArr = currentHeaderModifier(renderersArr);


        if (counters[dataType] > 0) {
          for (var i = 0; i < levels[dataType] + 1; i++) { // for each level of col groups add a header renderer
            if (!Array.isArray(renderersArr)) {
              renderersArr = typeof renderersArr === 'function' ? renderersArr() : new Array(renderersArr);
            }
            renderersArr.unshift(makeGroupIndicatorsForLevel());
          }
        }
      },
      /**
       * Get group levels array arranged by rows
       * @returns {Array}
       */
      getGroupLevelsByRows: function () {
        var rowGroups = getRowGroups()
            , result = [];

        for (var i = 0, groupsLength = rowGroups.length; i < groupsLength; i++) {
          if (rowGroups[i].rows) {
            for (var j = 0, groupRowsLength = rowGroups[i].rows.length; j < groupRowsLength; j++) {
              if (!result[rowGroups[i].rows[j]]) {
                result[rowGroups[i].rows[j]] = [];
              }
              result[rowGroups[i].rows[j]].push(rowGroups[i].level);
            }
          }
        }
        return result;
      },
      /**
       * Get group levels array arranged by cols
       * @returns {Array}
       */
      getGroupLevelsByCols: function () {
        var colGroups = getColGroups()
            , result = [];

        for (var i = 0, groupsLength = colGroups.length; i < groupsLength; i++) {
          if (colGroups[i].cols) {
            for (var j = 0, groupColsLength = colGroups[i].cols.length; j < groupColsLength; j++) {
              if (!result[colGroups[i].cols[j]]) {
                result[colGroups[i].cols[j]] = [];
              }
              result[colGroups[i].cols[j]].push(colGroups[i].level);
            }
          }
        }
        return result;
      },
      /**
       * Toggle the group visibility ( + / - event handler)
       * @param event
       * @param coords
       * @param TD
       */
      toggleGroupVisibility: function (event, coords, TD) {
        if (Handsontable.Dom.hasClass(event.target, classes.expandButton) ||
            Handsontable.Dom.hasClass(event.target, classes.collapseButton) ||
            Handsontable.Dom.hasClass(event.target, classes.levelTrigger)) {
          var element = event.target
              , elemIdSplit = element.id.split('-');

          var groups = []
              , id
              , level
              , type
              , hidden;

          var prepareGroupData = function (componentElement) {
            if (componentElement) {
              element = componentElement;
            }

            elemIdSplit = element.id.split('-');

            id = elemIdSplit[1];
            level = parseInt(element.getAttribute('data-level'), 10);
            type = element.getAttribute('data-type');
            hidden = parseInt(element.getAttribute('data-hidden'));

            if (isNaN(hidden)) {
              hidden = 1;
            } else {
              hidden = (hidden ? 0 : 1);
            }

            element.setAttribute('data-hidden', hidden.toString());


            groups.push(getGroupById(id));
          };

          if (element.className.indexOf(classes.levelTrigger) > -1) { // show levels below, hide all above
            var groupsInLevel
                , groupsToExpand = []
                , groupsToCollapse = []
                , levelType = element.id.indexOf("Rows") > -1 ? "rows" : "cols";

            for (var i = 1, levelsCount = levels[levelType]; i <= levelsCount; i++) {
              groupsInLevel = levelType == "rows" ? getRowGroupsByLevel(i) : getColGroupsByLevel(i);

              if (i >= parseInt(elemIdSplit[1], 10)) {
                for (var j = 0, groupCount = groupsInLevel.length; j < groupCount; j++) {
                  groupsToCollapse.push(groupsInLevel[j]);
                }
              } else {
                for (var j = 0, groupCount = groupsInLevel.length; j < groupCount; j++) {
                  groupsToExpand.push(groupsInLevel[j]);
                }
              }
            }

            showHideGroups(true, groupsToCollapse);
            showHideGroups(false, groupsToExpand);

          } else {
            prepareGroupData();
            showHideGroups(hidden, groups);
          }

          // add the expander button to a dummy spare row/col, if no longer needed -> remove it
          /* jshint -W038 */
          type = type || levelType;

          var lastHidden = isLastHidden(type)
              , typeUppercase = type.charAt(0).toUpperCase() + type.slice(1)
              , spareElements = Handsontable.Grouping['baseSpare' + typeUppercase];

          if (lastHidden) {
            /* jshint -W041 */
            if (spareElements == 0) {
              instance.alter('insert_' + type.slice(0, -1), instance['count' + typeUppercase]());
              Handsontable.Grouping["dummy" + type.slice(0, -1)] = true;
            }
          } else {
            /* jshint -W041 */
            if (spareElements == 0) {
              if (Handsontable.Grouping["dummy" + type.slice(0, -1)]) {
                instance.alter('remove_' + type.slice(0, -1), instance['count' + typeUppercase]() - 1);
                Handsontable.Grouping["dummy" + type.slice(0, -1)] = false;
              }
            }
          }

          instance.render();

          event.stopImmediatePropagation();
        }
      },
      /**
       * Modify the delta when changing cells using keyobard
       * @param position
       * @returns {Function}
       */
      modifySelectionFactory: function (position) {
        var instance = this.instance;
        var currentlySelected
            , nextPosition = new WalkontableCellCoords(0, 0)
            , nextVisible = function (direction, currentPosition) { // updates delta to skip to the next visible cell
              var updateDelta = 0;

              switch (direction) {
                case 'down':
                  while (isCollapsed(currentPosition)) {
                    updateDelta++;
                    currentPosition.row += 1;
                  }
                  break;
                case 'up':
                  while (isCollapsed(currentPosition)) {
                    updateDelta--;
                    currentPosition.row -= 1;
                  }
                  break;
                case 'right':
                  while (isCollapsed(currentPosition)) {
                    updateDelta++;
                    currentPosition.col += 1;
                  }
                  break;
                case 'left':
                  while (isCollapsed(currentPosition)) {
                    updateDelta--;
                    currentPosition.col -= 1;
                  }
                  break;
              }

              return updateDelta;
            }
            , updateDelta = function (delta, nextPosition) {
              if (delta.row > 0) { // moving down
                if (isCollapsed(nextPosition)) {
                  delta.row += nextVisible('down', nextPosition);
                }
              } else if (delta.row < 0) { // moving up
                if (isCollapsed(nextPosition)) {
                  delta.row += nextVisible('up', nextPosition);
                }
              }

              if (delta.col > 0) { // moving right
                if (isCollapsed(nextPosition)) {
                  delta.col += nextVisible('right', nextPosition);
                }
              } else if (delta.col < 0) { // moving left
                if (isCollapsed(nextPosition)) {
                  delta.col += nextVisible('left', nextPosition);
                }
              }
            };

        /* jshint -W027 */
        switch (position) {
          case 'start':
            return function (delta) {
              currentlySelected = instance.getSelected();
              nextPosition.row = currentlySelected[0] + delta.row;
              nextPosition.col = currentlySelected[1] + delta.col;

              updateDelta(delta, nextPosition);
            };
            break;
          case 'end':
            return function (delta) {
              currentlySelected = instance.getSelected();
              nextPosition.row = currentlySelected[2] + delta.row;
              nextPosition.col = currentlySelected[3] + delta.col;

              updateDelta(delta, nextPosition);
            };
            break;
        }
      },
      modifyRowHeight: function (height, row) {
        if (instance.view.wt.wtTable.rowFilter && isCollapsed({row: row, col: null})) {
          return 0;
        }
      },
      validateGroups: function () {

        var areRangesOverlapping = function (a, b) {
          if ((a[0] < b[0] && a[1] < b[1] && b[0] <= a[1]) ||
              (a[0] > b[0] && b[1] < a[1] && a[0] <= b[1])) {
            return true;
          }
        };

        var configGroups = instance.getSettings().groups
            , cols = []
            , rows = [];

        for (var i = 0, groupsLength = configGroups.length; i < groupsLength; i++) {
          if (configGroups[i].rows) {
            /* jshint -W027 */
            if(configGroups[i].rows.length === 1) { // single-entry group
              throw new Error("Grouping error:  Group {" + configGroups[i].rows[0] + "} is invalid. Cannot define single-entry groups.");
              return false;
            } else if(configGroups[i].rows.length === 0) {
              throw new Error("Grouping error:  Cannot define empty groups.");
              return false;
            }

            rows.push(configGroups[i].rows);

            for (var j = 0, rowsLength = rows.length; j < rowsLength; j++) {
              if (areRangesOverlapping(configGroups[i].rows, rows[j])) {

                throw new Error("Grouping error:  ranges {" + configGroups[i].rows[0] + ", " + configGroups[i].rows[1] + "} and {" + rows[j][0] + ", " + rows[j][1] + "} are overlapping.");
                return false;
              }
            }
          } else if (configGroups[i].cols) {

            if(configGroups[i].cols.length === 1) { // single-entry group
              throw new Error("Grouping error:  Group {" + configGroups[i].cols[0] + "} is invalid. Cannot define single-entry groups.");
              return false;
            } else if(configGroups[i].cols.length === 0) {
              throw new Error("Grouping error:  Cannot define empty groups.");
              return false;
            }

            cols.push(configGroups[i].cols);

            for (var j = 0, colsLength = cols.length; j < colsLength; j++) {
              if (areRangesOverlapping(configGroups[i].cols, cols[j])) {

                throw new Error("Grouping error:  ranges {" + configGroups[i].cols[0] + ", " + configGroups[i].cols[1] + "} and {" + cols[j][0] + ", " + cols[j][1] + "} are overlapping.");
                return false;
              }
            }
          }
        }

        return true;
      },
      afterGetRowHeaderRenderers: function (arr) {
        Handsontable.Grouping.groupIndicatorsFactory(arr, 'vertical');
      },
      afterGetColumnHeaderRenderers: function (arr) {
        Handsontable.Grouping.groupIndicatorsFactory(arr, 'horizontal');
      },
      hookProxy: function (fn, arg) {
        return function () {
          if (instance.getSettings().groups) {
            return arg ? Handsontable.Grouping[fn](arg).apply(this, arguments) : Handsontable.Grouping[fn].apply(this, arguments);
          } else {
            return void 0;
          }
        };
      }
    };
  };

  /**
   * create new instance
   */
  var init = function () {
    var instance = this,
        groupingSetting = !!(instance.getSettings().groups);


    if (groupingSetting) {
      var headerUpdates = {};

      Handsontable.Grouping = new Grouping(instance);

      if (!instance.getSettings().rowHeaders) { // force using rowHeaders  --  needs to be changed later
        headerUpdates.rowHeaders = true;
      }
      if (!instance.getSettings().colHeaders) { // force using colHeaders  --  needs to be changed later
        headerUpdates.colHeaders = true;
      }
      if (headerUpdates.colHeaders || headerUpdates.rowHeaders) {
        instance.updateSettings(headerUpdates);
      }

      var groupConfigValid = Handsontable.Grouping.validateGroups();
      if (!groupConfigValid) {
        return;
      }

      instance.addHook('beforeInit', Handsontable.Grouping.hookProxy('init'));
      instance.addHook('afterUpdateSettings', Handsontable.Grouping.hookProxy('updateGroups'));
      instance.addHook('afterGetColumnHeaderRenderers', Handsontable.Grouping.hookProxy('afterGetColumnHeaderRenderers'));
      instance.addHook('afterGetRowHeaderRenderers', Handsontable.Grouping.hookProxy('afterGetRowHeaderRenderers'));
      instance.addHook('afterGetRowHeader', Handsontable.Grouping.hookProxy('afterGetRowHeader'));
      instance.addHook('afterGetColHeader', Handsontable.Grouping.hookProxy('afterGetColHeader'));
      instance.addHook('beforeOnCellMouseDown', Handsontable.Grouping.hookProxy('toggleGroupVisibility'));
      instance.addHook('modifyTransformStart', Handsontable.Grouping.hookProxy('modifySelectionFactory', 'start'));
      instance.addHook('modifyTransformEnd', Handsontable.Grouping.hookProxy('modifySelectionFactory', 'end'));
      instance.addHook('modifyRowHeight', Handsontable.Grouping.hookProxy('modifyRowHeight'));
    }
  };

  /**
   * Update headers widths for the group indicators
   */
// TODO: this needs cleaning up
  var updateHeaderWidths = function () {
    var colgroups = document.querySelectorAll('colgroup');
    for (var i = 0, colgroupsLength = colgroups.length; i < colgroupsLength; i++) {
      var rowHeaders = colgroups[i].querySelectorAll('col.rowHeader');
      if (rowHeaders.length === 0) {
        return;
      }
      for (var j = 0, rowHeadersLength = rowHeaders.length + 1; j < rowHeadersLength; j++) {
        if (rowHeadersLength == 2) {
          return;
        }
        if (j < Handsontable.Grouping.getLevels().rows + 1) {
          if (j == Handsontable.Grouping.getLevels().rows) {
            Handsontable.Dom.addClass(rowHeaders[j], 'htGroupColClosest');
          } else {
            Handsontable.Dom.addClass(rowHeaders[j], 'htGroupCol');
          }
        }
      }
    }
  };

  Handsontable.hooks.add('beforeInit', init);

  Handsontable.hooks.add('afterUpdateSettings', function () {

    if (this.getSettings().groups && !Handsontable.Grouping) {
      init.call(this, arguments);
    } else if (!this.getSettings().groups && Handsontable.Grouping) {
      Handsontable.Grouping.resetGroups();
      Handsontable.Grouping = void 0;
    }
  });

  Handsontable.plugins.Grouping = Grouping;

  (function (Handsontable) {
    /**
     * Plugin used to allow user to copy and paste from the context menu
     * Currently uses ZeroClipboard due to browser limitations
     * @constructor
     */
    function ContextMenuCopyPaste() {
      this.zeroClipboardInstance = null;
      this.instance = null;
    }

    /**
     * Configure ZeroClipboard
     */
    ContextMenuCopyPaste.prototype.prepareZeroClipboard = function () {
      if(this.swfPath) {
        ZeroClipboard.config({
          swfPath: this.swfPath
        });
      }
    };

    /**
     * Copy action
     * @returns {CopyPasteClass.elTextarea.value|*}
     */
    ContextMenuCopyPaste.prototype.copy = function () {
      this.instance.copyPaste.setCopyableText();
      return this.instance.copyPaste.copyPasteInstance.elTextarea.value;
    };

    /**
     * Adds copy/paste items to context menu
     */
    ContextMenuCopyPaste.prototype.addToContextMenu = function (defaultOptions) {
      if (!this.getSettings().contextMenuCopyPaste) {
        return;
      }

      defaultOptions.items.unshift(
          {
            key: 'copy',
            name: 'Copy'
          },
          {
            key: 'paste',
            name: 'Paste',
            callback: function () {
              this.copyPaste.triggerPaste();
            }
          },
          Handsontable.ContextMenu.SEPARATOR
      );
    };

    /**
     * Setup ZeroClipboard swf clip position and event handlers
     * @param cmInstance Current context menu instance
     */
    ContextMenuCopyPaste.prototype.setupZeroClipboard = function (cmInstance) {
      var plugin = this;
      this.cmInstance = cmInstance;

      if (!Handsontable.Dom.hasClass(this.cmInstance.rootElement, 'htContextMenu')) {
        return;
      }

      var data = cmInstance.getData();
      for (var i = 0, ilen = data.length; i < ilen; i++) { //find position of 'copy' option
        /*jshint -W083 */
        if (data[i].key === 'copy') {
          this.zeroClipboardInstance = new ZeroClipboard(cmInstance.getCell(i, 0));

          this.zeroClipboardInstance.off();
          this.zeroClipboardInstance.on("copy", function (event) {
            var clipboard = event.clipboardData;
            clipboard.setData("text/plain", plugin.copy());
            plugin.instance.getSettings().outsideClickDeselects = plugin.outsideClickDeselectsCache;
          });

          cmCopyPaste.bindEvents();
          break;
        }
      }
    };

    /**
     * Bind all the standard events
     */
    ContextMenuCopyPaste.prototype.bindEvents = function () {
      var plugin = this;

      // Workaround for 'current' and 'zeroclipboard-is-hover' classes being stuck when moving the cursor over the context menu
      if (plugin.cmInstance) {

        var eventManager = new Handsontable.eventManager(this.instance);

        var removeCurrenClass = function (event) {
          var hadClass = plugin.cmInstance.rootElement.querySelector('td.current');
          if (hadClass) {
            Handsontable.Dom.removeClass(hadClass, 'current');
          }
          plugin.outsideClickDeselectsCache = plugin.instance.getSettings().outsideClickDeselects;
          plugin.instance.getSettings().outsideClickDeselects = false;
        };

        var removeZeroClipboardClass = function (event) {
          var hadClass = plugin.cmInstance.rootElement.querySelector('td.zeroclipboard-is-hover');
          if (hadClass) {
            Handsontable.Dom.removeClass(hadClass, 'zeroclipboard-is-hover');
          }
          plugin.instance.getSettings().outsideClickDeselects = plugin.outsideClickDeselectsCache;
        };

        eventManager.removeEventListener(document,'mouseenter', function () {
          removeCurrenClass();
        });
        eventManager.addEventListener(document, 'mouseenter', function (e) {
          removeCurrenClass();
        });

        eventManager.removeEventListener(document,'mouseleave', function () {
          removeZeroClipboardClass();
        });
        eventManager.addEventListener(document, 'mouseleave', function (e) {
          removeZeroClipboardClass();
        });


      }
    };

    /**
     * Initialize plugin
     * @returns {boolean} Returns false if ZeroClipboard is not properly included
     */
    ContextMenuCopyPaste.prototype.init = function () {
      if (!this.getSettings().contextMenuCopyPaste) {
        return;
      } else if (typeof this.getSettings().contextMenuCopyPaste == "object") {
        cmCopyPaste.swfPath = this.getSettings().contextMenuCopyPaste.swfPath;
      }

      /* jshint ignore:start */
      if (typeof ZeroClipboard === 'undefined') {
        throw new Error("To be able to use the Copy/Paste feature from the context menu, you need to manualy include ZeroClipboard.js file to your website.");

        return false;
      }
      try {
        var flashTest = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
      } catch(exception) {
        if (!('undefined' != typeof navigator.mimeTypes['application/x-shockwave-flash'])) {
          throw new Error("To be able to use the Copy/Paste feature from the context menu, your browser needs to have Flash Plugin installed.");

          return false;
        }
      }
      /* jshint ignore:end */

      cmCopyPaste.instance = this;
      cmCopyPaste.prepareZeroClipboard();
    };

    var cmCopyPaste = new ContextMenuCopyPaste();

    Handsontable.hooks.add('afterRender', function () {
      cmCopyPaste.setupZeroClipboard(this);
    });

    Handsontable.hooks.add('afterInit', cmCopyPaste.init);
    Handsontable.hooks.add('afterContextMenuDefaultOptions', cmCopyPaste.addToContextMenu);
    Handsontable.ContextMenuCopyPaste = ContextMenuCopyPaste;

  })(Handsontable);

  (function (Handsontable) {
    'use strict';

    function MultipleSelectionHandles(instance) {
      this.instance = instance;
      this.dragged = [];

      this.eventManager = Handsontable.eventManager(instance);

      this.bindTouchEvents();
    }

    MultipleSelectionHandles.prototype.getCurrentRangeCoords = function (selectedRange, currentTouch, touchStartDirection, currentDirection, draggedHandle) {
      var topLeftCorner = selectedRange.getTopLeftCorner()
          , bottomRightCorner = selectedRange.getBottomRightCorner()
          , bottomLeftCorner = selectedRange.getBottomLeftCorner()
          , topRightCorner = selectedRange.getTopRightCorner();

      var newCoords = {
        start: null,
        end: null
      };

      switch (touchStartDirection) {
        case "NE-SW":
          switch (currentDirection) {
            case "NE-SW":
            case "NW-SE":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: new WalkontableCellCoords(currentTouch.row, selectedRange.highlight.col),
                  end: new WalkontableCellCoords(bottomLeftCorner.row, currentTouch.col)
                };
              } else {
                newCoords = {
                  start: new WalkontableCellCoords(selectedRange.highlight.row, currentTouch.col),
                  end: new WalkontableCellCoords(currentTouch.row, topLeftCorner.col)
                };
              }
              break;
            case "SE-NW":
              if (draggedHandle == "bottomRight") {
                newCoords = {
                  start: new WalkontableCellCoords(bottomRightCorner.row, currentTouch.col),
                  end: new WalkontableCellCoords(currentTouch.row, topLeftCorner.col)
                };
              }
              break;
            //case "SW-NE":
            //  break;
          }
          break;
        case "NW-SE":
          switch (currentDirection) {
            case "NE-SW":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: currentTouch,
                  end: bottomLeftCorner
                };
              } else {
                newCoords.end  = currentTouch;
              }
              break;
            case "NW-SE":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: currentTouch,
                  end: bottomRightCorner
                };
              } else {
                newCoords.end  = currentTouch;
              }
              break;
            case "SE-NW":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: currentTouch,
                  end: topLeftCorner
                };
              } else {
                newCoords.end  = currentTouch;
              }
              break;
            case "SW-NE":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: currentTouch,
                  end: topRightCorner
                };
              } else {
                newCoords.end  = currentTouch;
              }
              break;
          }
          break;
        case "SW-NE":
          switch (currentDirection) {
            case "NW-SE":
              if (draggedHandle == "bottomRight") {
                newCoords = {
                  start: new WalkontableCellCoords(currentTouch.row, topLeftCorner.col),
                  end: new WalkontableCellCoords(bottomLeftCorner.row, currentTouch.col)
                };
              } else {
                newCoords = {
                  start: new WalkontableCellCoords(topLeftCorner.row, currentTouch.col),
                  end: new WalkontableCellCoords(currentTouch.row, bottomRightCorner.col)
                };
              }
              break;
            //case "NE-SW":
            //
            //  break;
            case "SW-NE":
              if (draggedHandle == "topLeft") {
                newCoords = {
                  start: new WalkontableCellCoords(selectedRange.highlight.row, currentTouch.col),
                  end: new WalkontableCellCoords(currentTouch.row, bottomRightCorner.col)
                };
              } else {
                newCoords = {
                  start: new WalkontableCellCoords(currentTouch.row, topLeftCorner.col),
                  end: new WalkontableCellCoords(topLeftCorner.row, currentTouch.col)
                };
              }
              break;
            case "SE-NW":
              if (draggedHandle == "bottomRight") {
                newCoords = {
                  start: new WalkontableCellCoords(currentTouch.row, topRightCorner.col),
                  end: new WalkontableCellCoords(topLeftCorner.row, currentTouch.col)
                };
              } else if (draggedHandle == "topLeft") {
                newCoords = {
                  start: bottomLeftCorner,
                  end: currentTouch
                };
              }
              break;
          }
          break;
        case "SE-NW":
          switch (currentDirection) {
            case "NW-SE":
            case "NE-SW":
            case "SW-NE":
              if (draggedHandle == "topLeft") {
                newCoords.end = currentTouch;
              }
              break;
            case "SE-NW":
              if (draggedHandle == "topLeft") {
                newCoords.end = currentTouch;
              } else {
                newCoords = {
                  start: currentTouch,
                  end: topLeftCorner
                };
              }
              break;
          }
          break;
      }

      return newCoords;
    };

    MultipleSelectionHandles.prototype.bindTouchEvents = function () {
      var that = this;
      var removeFromDragged = function (query) {

        if (this.dragged.length == 1) {
          this.dragged = [];
          return true;
        }

        var entryPosition = this.dragged.indexOf(query);

        if (entryPosition == -1) {
          return false;
        } else if (entryPosition === 0) {
          this.dragged = this.dragged.slice(0, 1);
        } else if (entryPosition == 1) {
          this.dragged = this.dragged.slice(-1);
        }
      };

      this.eventManager.addEventListener(this.instance.rootElement,'touchstart', function (event) {
        if(Handsontable.Dom.hasClass(event.target, "topLeftSelectionHandle-HitArea")) {
          that.dragged.push("topLeft");
          var selectedRange = that.instance.getSelectedRange();
          that.touchStartRange = {
            width: selectedRange.getWidth(),
            height: selectedRange.getHeight(),
            direction: selectedRange.getDirection()
          };
          event.preventDefault();

          return false;
        } else if (Handsontable.Dom.hasClass(event.target, "bottomRightSelectionHandle-HitArea")) {
          that.dragged.push("bottomRight");
          var selectedRange = that.instance.getSelectedRange();
          that.touchStartRange = {
            width: selectedRange.getWidth(),
            height: selectedRange.getHeight(),
            direction: selectedRange.getDirection()
          };
          event.preventDefault();

          return false;
        }
      });

      this.eventManager.addEventListener(this.instance.rootElement,'touchend', function (event) {
        if(Handsontable.Dom.hasClass(event.target, "topLeftSelectionHandle-HitArea")) {
          removeFromDragged.call(that, "topLeft");
          that.touchStartRange = void 0;
          event.preventDefault();

          return false;
        } else if (Handsontable.Dom.hasClass(event.target, "bottomRightSelectionHandle-HitArea")) {
          removeFromDragged.call(that, "bottomRight");
          that.touchStartRange = void 0;
          event.preventDefault();

          return false;
        }
      });

      this.eventManager.addEventListener(this.instance.rootElement,'touchmove', function (event) {
        var scrollTop = Handsontable.Dom.getWindowScrollTop()
            , scrollLeft = Handsontable.Dom.getWindowScrollLeft();

        if (that.dragged.length > 0) {
          var endTarget = document.elementFromPoint(
              event.touches[0].screenX - scrollLeft,
              event.touches[0].screenY - scrollTop
          );

          if(!endTarget) {
            return;
          }

          if (endTarget.nodeName == "TD" || endTarget.nodeName == "TH") {
            var targetCoords = that.instance.getCoords(endTarget);

            if(targetCoords.col == -1) {
              targetCoords.col = 0;
            }

            var selectedRange = that.instance.getSelectedRange()
                , rangeWidth = selectedRange.getWidth()
                , rangeHeight = selectedRange.getHeight()
                , rangeDirection = selectedRange.getDirection();

            if (rangeWidth == 1 && rangeHeight == 1) {
              that.instance.selection.setRangeEnd(targetCoords);
            }

            var newRangeCoords = that.getCurrentRangeCoords(selectedRange, targetCoords, that.touchStartRange.direction, rangeDirection, that.dragged[0]);

            if(newRangeCoords.start != null) {
              that.instance.selection.setRangeStart(newRangeCoords.start);
            }
            that.instance.selection.setRangeEnd(newRangeCoords.end);

          }

          event.preventDefault();
        }
      });

    };

    MultipleSelectionHandles.prototype.isDragged = function () {
      if (this.dragged.length === 0) {
        return false;
      } else {
        return true;
      }
    };

    var init = function () {
      var instance = this;

      Handsontable.plugins.multipleSelectionHandles = new MultipleSelectionHandles(instance);
    };

    Handsontable.hooks.add('afterInit', init);

  })(Handsontable);

  var TouchScroll = (function(instance) {

    function TouchScroll(instance) {}

    TouchScroll.prototype.init = function(instance) {
      this.instance = instance;
      this.bindEvents();

      this.scrollbars = [
        this.instance.view.wt.wtOverlays.topOverlay,
        this.instance.view.wt.wtOverlays.leftOverlay,
        this.instance.view.wt.wtOverlays.topLeftCornerOverlay
      ];

      this.clones = [
        this.instance.view.wt.wtOverlays.topOverlay.clone.wtTable.holder.parentNode,
        this.instance.view.wt.wtOverlays.leftOverlay.clone.wtTable.holder.parentNode,
        this.instance.view.wt.wtOverlays.topLeftCornerOverlay.clone.wtTable.holder.parentNode
      ];
    };

    TouchScroll.prototype.bindEvents = function () {
      var that = this;

      this.instance.addHook('beforeTouchScroll', function () {
        Handsontable.freezeOverlays = true;

        for(var i = 0, cloneCount = that.clones.length; i < cloneCount ; i++) {
          Handsontable.Dom.addClass(that.clones[i], 'hide-tween');
        }
      });

      this.instance.addHook('afterMomentumScroll', function () {
        Handsontable.freezeOverlays = false;

        for(var i = 0, cloneCount = that.clones.length; i < cloneCount ; i++) {
          Handsontable.Dom.removeClass(that.clones[i], 'hide-tween');
        }

        for(var i = 0, cloneCount = that.clones.length; i < cloneCount ; i++) {
          Handsontable.Dom.addClass(that.clones[i], 'show-tween');
        }

        setTimeout(function () {
          for(var i = 0, cloneCount = that.clones.length; i < cloneCount ; i++) {
            Handsontable.Dom.removeClass(that.clones[i], 'show-tween');
          }
        },400);

        for(var i = 0, cloneCount = that.scrollbars.length; i < cloneCount ; i++) {
          that.scrollbars[i].refresh();
          that.scrollbars[i].resetFixedPosition();
        }

      });

    };

    return TouchScroll;
  }());

  var touchScrollHandler = new TouchScroll();

  Handsontable.hooks.add('afterInit', function() {
    touchScrollHandler.init.call(touchScrollHandler, this);
  });

  (function (Handsontable) {
    function ManualColumnFreeze(instance) {
      var fixedColumnsCount = instance.getSettings().fixedColumnsLeft;

      var init = function () {
        // update plugin usages count for manualColumnPositions
        if (typeof instance.manualColumnPositionsPluginUsages != 'undefined') {
          instance.manualColumnPositionsPluginUsages.push('manualColumnFreeze');
        } else {
          instance.manualColumnPositionsPluginUsages = ['manualColumnFreeze'];
        }

        bindHooks();
      };

      /**
       * Modifies the default Context Menu entry list to consist 'freeze/unfreeze this column' entries
       * @param {Object} defaultOptions
       */
      function addContextMenuEntry(defaultOptions) {
        defaultOptions.items.push(
            Handsontable.ContextMenu.SEPARATOR,
            {
              key: 'freeze_column',
              name: function () {
                var selectedColumn = instance.getSelected()[1];
                if (selectedColumn > fixedColumnsCount - 1) {
                  return 'Freeze this column';
                } else {
                  return 'Unfreeze this column';
                }
              },
              disabled: function () {
                var selection = instance.getSelected();
                return selection[1] !== selection[3];
              },
              callback: function () {
                var selectedColumn = instance.getSelected()[1];
                if (selectedColumn > fixedColumnsCount - 1) {
                  freezeColumn(selectedColumn);
                } else {
                  unfreezeColumn(selectedColumn);
                }
              }
            }
        );
      }

      /**
       * Increments the fixed columns count by one
       */
      function addFixedColumn() {
        instance.updateSettings({
          fixedColumnsLeft: fixedColumnsCount + 1
        });
        fixedColumnsCount++;
      }

      /**
       * Decrements the fixed columns count by one
       */
      function removeFixedColumn() {
        instance.updateSettings({
          fixedColumnsLeft: fixedColumnsCount - 1
        });
        fixedColumnsCount--;
      }

      /**
       * Checks whether 'manualColumnPositions' array needs creating and/or initializing
       * @param {Number} [col]
       */
      function checkPositionData(col) {
        if (!instance.manualColumnPositions || instance.manualColumnPositions.length === 0) {
          if (!instance.manualColumnPositions) {
            instance.manualColumnPositions = [];
          }
        }
        if (col) {
          if (!instance.manualColumnPositions[col]) {
            createPositionData(col + 1);
          }
        } else {
          createPositionData(instance.countCols());
        }
      }

      /**
       * Fills the 'manualColumnPositions' array with consecutive column indexes
       * @param {Number} len
       */
      function createPositionData(len) {
        if (instance.manualColumnPositions.length < len) {
          for (var i = instance.manualColumnPositions.length; i < len; i++) {
            instance.manualColumnPositions[i] = i;
          }
        }
      }

      /**
       * Updates the column order array used by modifyCol callback
       * @param {Number} col
       * @param {Number} actualCol column index of the currently selected cell
       * @param {Number|null} returnCol suggested return slot for the unfreezed column (can be null)
       * @param {String} action 'freeze' or 'unfreeze'
       */
      function modifyColumnOrder(col, actualCol, returnCol, action) {
        if (returnCol == null) {
          returnCol = col;
        }

        if (action === 'freeze') {
          instance.manualColumnPositions.splice(fixedColumnsCount, 0, instance.manualColumnPositions.splice(actualCol, 1)[0]);
        } else if (action === 'unfreeze') {
          instance.manualColumnPositions.splice(returnCol, 0, instance.manualColumnPositions.splice(actualCol, 1)[0]);
        }
      }

      /**
       * Estimates the most fitting return position for unfreezed column
       * @param {Number} col
       */
      function getBestColumnReturnPosition(col) {
        var i = fixedColumnsCount,
            j = getModifiedColumnIndex(i),
            initialCol = getModifiedColumnIndex(col);
        while (j < initialCol) {
          i++;
          j = getModifiedColumnIndex(i);
        }
        return i - 1;
      }

      /**
       * Freeze the given column (add it to fixed columns)
       * @param {Number} col
       */
      function freezeColumn(col) {
        if (col <= fixedColumnsCount - 1) {
          return; // already fixed
        }

        var modifiedColumn = getModifiedColumnIndex(col) || col;
        checkPositionData(modifiedColumn);
        modifyColumnOrder(modifiedColumn, col, null, 'freeze');

        addFixedColumn();

        instance.view.wt.wtOverlays.leftOverlay.refresh();
      }

      /**
       * Unfreeze the given column (remove it from fixed columns and bring to it's previous position)
       * @param {Number} col
       */
      function unfreezeColumn(col) {
        if (col > fixedColumnsCount - 1) {
          return; // not fixed
        }

        var returnCol = getBestColumnReturnPosition(col);

        var modifiedColumn = getModifiedColumnIndex(col) || col;
        checkPositionData(modifiedColumn);
        modifyColumnOrder(modifiedColumn, col, returnCol, 'unfreeze');
        removeFixedColumn();

        instance.view.wt.wtOverlays.leftOverlay.refresh();
      }

      function getModifiedColumnIndex(col) {
        return instance.manualColumnPositions[col];
      }

      /**
       * 'modiftyCol' callback
       * @param {Number} col
       */
      function onModifyCol(col) {
        if (this.manualColumnPositionsPluginUsages.length > 1) { // if another plugin is using manualColumnPositions to modify column order, do not double the translation
          return col;
        }
        return getModifiedColumnIndex(col);
      }

      function bindHooks() {
        //instance.addHook('afterGetColHeader', onAfterGetColHeader);
        instance.addHook('modifyCol', onModifyCol);
        instance.addHook('afterContextMenuDefaultOptions', addContextMenuEntry);
      }

      return {
        init: init,
        freezeColumn: freezeColumn,
        unfreezeColumn: unfreezeColumn,
        helpers: {
          addFixedColumn: addFixedColumn,
          removeFixedColumn: removeFixedColumn,
          checkPositionData: checkPositionData,
          modifyColumnOrder: modifyColumnOrder,
          getBestColumnReturnPosition: getBestColumnReturnPosition
        }
      };
    }

    var init = function init() {
      if (!this.getSettings().manualColumnFreeze) {
        return;
      }

      var mcfPlugin;

      Handsontable.plugins.manualColumnFreeze = ManualColumnFreeze;
      this.manualColumnFreeze = new ManualColumnFreeze(this);

      mcfPlugin = this.manualColumnFreeze;
      mcfPlugin.init.call(this);
    };

    Handsontable.hooks.add('beforeInit', init);

  })(Handsontable);



  /**
   * Creates an overlay over the original Walkontable instance. The overlay renders the clone of the original Walkontable
   * and (optionally) implements behavior needed for native horizontal and vertical scrolling
   */
  function WalkontableOverlay() {}

  /*
   Possible optimizations:
   [x] don't rerender if scroll delta is smaller than the fragment outside of the viewport
   [ ] move .style.top change before .draw()
   [ ] put .draw() in requestAnimationFrame
   [ ] don't rerender rows that remain visible after the scroll
   */

  WalkontableOverlay.prototype.init = function () {
    this.TABLE = this.instance.wtTable.TABLE;
    this.hider = this.instance.wtTable.hider;
    this.spreader = this.instance.wtTable.spreader;
    this.holder = this.instance.wtTable.holder;
    this.wtRootElement = this.instance.wtTable.wtRootElement;
    this.trimmingContainer = Handsontable.Dom.getTrimmingContainer(this.hider.parentNode.parentNode);
    this.mainTableScrollableElement = Handsontable.Dom.getScrollableElement(this.instance.wtTable.TABLE);
  };

  WalkontableOverlay.prototype.makeClone = function (direction) {
    var clone = document.createElement('DIV');
    clone.className = 'ht_clone_' + direction + ' handsontable';
    clone.style.position = 'absolute';
    clone.style.top = 0;
    clone.style.left = 0;
    clone.style.overflow = 'hidden';

    var clonedTable = document.createElement('TABLE');
    clonedTable.className = this.instance.wtTable.TABLE.className;
    clone.appendChild(clonedTable);

    this.instance.wtTable.wtRootElement.parentNode.appendChild(clone);

    return new Walkontable({
      cloneSource: this.instance,
      cloneOverlay: this,
      table: clonedTable
    });
  };

  WalkontableOverlay.prototype.refresh = function (fastDraw) {
    if (this.clone) {
      this.clone.draw(fastDraw);
    }
  };

  WalkontableOverlay.prototype.destroy = function () {
    var eventManager = Handsontable.eventManager(this.clone);

    eventManager.clear();
  };

  function WalkontableBorder(instance, settings) {
    var style;
    var createMultipleSelectorHandles = function () {
      this.selectionHandles = {
        topLeft: document.createElement('DIV'),
        topLeftHitArea: document.createElement('DIV'),
        bottomRight: document.createElement('DIV'),
        bottomRightHitArea: document.createElement('DIV')
      };
      var width = 10
          , hitAreaWidth = 40;

      this.selectionHandles.topLeft.className = 'topLeftSelectionHandle';
      this.selectionHandles.topLeftHitArea.className = 'topLeftSelectionHandle-HitArea';
      this.selectionHandles.bottomRight.className = 'bottomRightSelectionHandle';
      this.selectionHandles.bottomRightHitArea.className = 'bottomRightSelectionHandle-HitArea';

      this.selectionHandles.styles = {
        topLeft: this.selectionHandles.topLeft.style,
        topLeftHitArea: this.selectionHandles.topLeftHitArea.style,
        bottomRight: this.selectionHandles.bottomRight.style,
        bottomRightHitArea: this.selectionHandles.bottomRightHitArea.style
      };

      var hitAreaStyle = {
        'position': 'absolute',
        'height': hitAreaWidth + 'px',
        'width': hitAreaWidth + 'px',
        'border-radius': parseInt(hitAreaWidth/1.5,10) + 'px'
      };

      for (var prop in hitAreaStyle) {
        if (hitAreaStyle.hasOwnProperty(prop)) {
          this.selectionHandles.styles.bottomRightHitArea[prop] = hitAreaStyle[prop];
          this.selectionHandles.styles.topLeftHitArea[prop] = hitAreaStyle[prop];
        }
      }

      var handleStyle = {
        'position': 'absolute',
        'height': width + 'px',
        'width': width + 'px',
        'border-radius': parseInt(width/1.5,10) + 'px',
        'background': '#F5F5FF',
        'border': '1px solid #4285c8'
      };

      for (var prop in handleStyle) {
        if (handleStyle.hasOwnProperty(prop)) {
          this.selectionHandles.styles.bottomRight[prop] = handleStyle[prop];
          this.selectionHandles.styles.topLeft[prop] = handleStyle[prop];
        }
      }

      this.main.appendChild(this.selectionHandles.topLeft);
      this.main.appendChild(this.selectionHandles.bottomRight);
      this.main.appendChild(this.selectionHandles.topLeftHitArea);
      this.main.appendChild(this.selectionHandles.bottomRightHitArea);
    };

    if(!settings){
      return;
    }

    var eventManager = Handsontable.eventManager(instance);

    //reference to instance
    this.instance = instance;
    this.settings = settings;

    this.main = document.createElement("div");
    style = this.main.style;
    style.position = 'absolute';
    style.top = 0;
    style.left = 0;

    var borderDivs = ['top','left','bottom','right','corner'];

    for (var i = 0; i < 5; i++) {
      var position = borderDivs[i];

      var DIV = document.createElement('DIV');
      DIV.className = 'wtBorder ' + (this.settings.className || ''); // + borderDivs[i];
      if(this.settings[position] && this.settings[position].hide){
        DIV.className += " hidden";
      }

      style = DIV.style;
      style.backgroundColor = (this.settings[position] && this.settings[position].color) ? this.settings[position].color : settings.border.color;
      style.height = (this.settings[position] && this.settings[position].width) ? this.settings[position].width + 'px' : settings.border.width + 'px';
      style.width = (this.settings[position] && this.settings[position].width) ? this.settings[position].width + 'px' : settings.border.width + 'px';

      this.main.appendChild(DIV);
    }

    this.top = this.main.childNodes[0];
    this.left = this.main.childNodes[1];
    this.bottom = this.main.childNodes[2];
    this.right = this.main.childNodes[3];

    this.topStyle = this.top.style;
    this.leftStyle = this.left.style;
    this.bottomStyle = this.bottom.style;
    this.rightStyle = this.right.style;

    this.cornerDefaultStyle = {
      width: '5px',
      height: '5px',
      borderWidth: '2px',
      borderStyle: 'solid',
      borderColor: '#FFF'
    };

    this.corner = this.main.childNodes[4];
    this.corner.className += ' corner';
    this.cornerStyle = this.corner.style;
    this.cornerStyle.width = this.cornerDefaultStyle.width;
    this.cornerStyle.height = this.cornerDefaultStyle.height;
    this.cornerStyle.border = [
      this.cornerDefaultStyle.borderWidth,
      this.cornerDefaultStyle.borderStyle,
      this.cornerDefaultStyle.borderColor
    ].join(' ');

    if(Handsontable.mobileBrowser) {
      createMultipleSelectorHandles.call(this);
    }

    this.disappear();
    if (!instance.wtTable.bordersHolder) {
      instance.wtTable.bordersHolder = document.createElement('div');
      instance.wtTable.bordersHolder.className = 'htBorders';

      instance.wtTable.spreader.appendChild(instance.wtTable.bordersHolder);

    }
    instance.wtTable.bordersHolder.insertBefore(this.main, instance.wtTable.bordersHolder.firstChild);

    var down = false;



    eventManager.addEventListener(document.body, 'mousedown', function () {
      down = true;
    });


    eventManager.addEventListener(document.body, 'mouseup', function () {
      down = false;
    });

    /* jshint ignore:start */
    for (var c = 0, len = this.main.childNodes.length; c < len; c++) {

      eventManager.addEventListener(this.main.childNodes[c], 'mouseenter', function (event) {
        if (!down || !instance.getSetting('hideBorderOnMouseDownOver')) {
          return;
        }
        event.preventDefault();
        event.stopImmediatePropagation();

        var bounds = this.getBoundingClientRect();

        this.style.display = 'none';

        var isOutside = function (event) {
          if (event.clientY < Math.floor(bounds.top)) {
            return true;
          }
          if (event.clientY > Math.ceil(bounds.top + bounds.height)) {
            return true;
          }
          if (event.clientX < Math.floor(bounds.left)) {
            return true;
          }
          if (event.clientX > Math.ceil(bounds.left + bounds.width)) {
            return true;
          }
        };

        var handler = function (event) {
          if (isOutside(event)) {
            eventManager.removeEventListener(document.body, 'mousemove', handler);
            this.style.display = 'block';
          }
        };
        eventManager.addEventListener(document.body, 'mousemove', handler);
      });
    }
    /* jshint ignore:end */
  }

  /**
   * Show border around one or many cells
   * @param {Array} corners
   */
  WalkontableBorder.prototype.appear = function (corners) {
    if (this.disabled) {
      return;
    }

    var instance = this.instance;

    var isMultiple,
        fromTD,
        toTD,
        fromOffset,
        toOffset,
        containerOffset,
        top,
        minTop,
        left,
        minLeft,
        height,
        width,
        fromRow,
        fromColumn,
        toRow,
        toColumn,
        i,
        ilen,
        s;

    var isPartRange = function () {
      if(this.instance.selections.area.cellRange) {

        if (toRow != this.instance.selections.area.cellRange.to.row ||
            toColumn != this.instance.selections.area.cellRange.to.col) {
          return true;
        }
      }

      return false;
    };

    var updateMultipleSelectionHandlesPosition = function (top, left, width, height) {
      var handleWidth = parseInt(this.selectionHandles.styles.topLeft.width, 10)
          , hitAreaWidth = parseInt(this.selectionHandles.styles.topLeftHitArea.width, 10);

      this.selectionHandles.styles.topLeft.top = parseInt(top - handleWidth,10) + "px";
      this.selectionHandles.styles.topLeft.left = parseInt(left - handleWidth,10) + "px";

      this.selectionHandles.styles.topLeftHitArea.top = parseInt(top - (hitAreaWidth/4)*3,10) + "px";
      this.selectionHandles.styles.topLeftHitArea.left = parseInt(left - (hitAreaWidth/4)*3,10) + "px";

      this.selectionHandles.styles.bottomRight.top = parseInt(top + height,10) + "px";
      this.selectionHandles.styles.bottomRight.left = parseInt(left + width,10) + "px";

      this.selectionHandles.styles.bottomRightHitArea.top = parseInt(top + height - hitAreaWidth/4,10) + "px";
      this.selectionHandles.styles.bottomRightHitArea.left = parseInt(left + width - hitAreaWidth/4,10) + "px";

      if(this.settings.border.multipleSelectionHandlesVisible && this.settings.border.multipleSelectionHandlesVisible()) {
        this.selectionHandles.styles.topLeft.display = "block";
        this.selectionHandles.styles.topLeftHitArea.display = "block";
        if(!isPartRange.call(this)) {
          this.selectionHandles.styles.bottomRight.display = "block";
          this.selectionHandles.styles.bottomRightHitArea.display = "block";
        } else {
          this.selectionHandles.styles.bottomRight.display = "none";
          this.selectionHandles.styles.bottomRightHitArea.display = "none";
        }
      } else {
        this.selectionHandles.styles.topLeft.display = "none";
        this.selectionHandles.styles.bottomRight.display = "none";
        this.selectionHandles.styles.topLeftHitArea.display = "none";
        this.selectionHandles.styles.bottomRightHitArea.display = "none";
      }

      if(fromRow == this.instance.wtSettings.getSetting('fixedRowsTop') || fromColumn == this.instance.wtSettings.getSetting('fixedColumnsLeft')) {
        this.selectionHandles.styles.topLeft.zIndex = "9999";
        this.selectionHandles.styles.topLeftHitArea.zIndex = "9999";
      } else {
        this.selectionHandles.styles.topLeft.zIndex = "";
        this.selectionHandles.styles.topLeftHitArea.zIndex = "";
      }

    };

    if (instance.cloneOverlay instanceof WalkontableTopOverlay || instance.cloneOverlay instanceof WalkontableCornerOverlay) {
      ilen = instance.getSetting('fixedRowsTop');
    }
    else {
      ilen = instance.wtTable.getRenderedRowsCount();
    }

    for (i = 0; i < ilen; i++) {
      s = instance.wtTable.rowFilter.renderedToSource(i);
      if (s >= corners[0] && s <= corners[2]) {
        fromRow = s;
        break;
      }
    }

    for (i = ilen - 1; i >= 0; i--) {
      s = instance.wtTable.rowFilter.renderedToSource(i);
      if (s >= corners[0] && s <= corners[2]) {
        toRow = s;
        break;
      }
    }

    ilen = instance.wtTable.getRenderedColumnsCount();

    for (i = 0; i < ilen; i++) {
      s = instance.wtTable.columnFilter.renderedToSource(i);
      if (s >= corners[1] && s <= corners[3]) {
        fromColumn = s;
        break;
      }
    }

    for (i = ilen - 1; i >= 0; i--) {
      s = instance.wtTable.columnFilter.renderedToSource(i);
      if (s >= corners[1] && s <= corners[3]) {
        toColumn = s;
        break;
      }
    }

    if (fromRow !== void 0 && fromColumn !== void 0) {
      isMultiple = (fromRow !== toRow || fromColumn !== toColumn);
      fromTD = instance.wtTable.getCell(new WalkontableCellCoords(fromRow, fromColumn));
      toTD = isMultiple ? instance.wtTable.getCell(new WalkontableCellCoords(toRow, toColumn)) : fromTD;
      fromOffset = Handsontable.Dom.offset(fromTD);
      toOffset = isMultiple ? Handsontable.Dom.offset(toTD) : fromOffset;
      containerOffset = Handsontable.Dom.offset(instance.wtTable.TABLE);

      minTop = fromOffset.top;
      height = toOffset.top + Handsontable.Dom.outerHeight(toTD) - minTop;
      minLeft = fromOffset.left;
      width = toOffset.left + Handsontable.Dom.outerWidth(toTD) - minLeft;


      top = minTop - containerOffset.top - 1;
      left = minLeft - containerOffset.left - 1;




      var style = Handsontable.Dom.getComputedStyle(fromTD);
      if (parseInt(style['borderTopWidth'], 10) > 0) {
        top += 1;
        height = height > 0 ? height - 1 : 0;
      }
      if (parseInt(style['borderLeftWidth'], 10) > 0) {
        left += 1;
        width = width > 0 ? width - 1 : 0;
      }
    }
    else {
      this.disappear();
      return;
    }

    this.topStyle.top = top + 'px';
    this.topStyle.left = left + 'px';
    this.topStyle.width = width + 'px';
    this.topStyle.display = 'block';

    this.leftStyle.top = top + 'px';
    this.leftStyle.left = left + 'px';
    this.leftStyle.height = height + 'px';
    this.leftStyle.display = 'block';

    var delta = Math.floor(this.settings.border.width / 2);

    this.bottomStyle.top = top + height - delta + 'px';
    this.bottomStyle.left = left + 'px';
    this.bottomStyle.width = width + 'px';
    this.bottomStyle.display = 'block';

    this.rightStyle.top = top + 'px';
    this.rightStyle.left = left + width - delta + 'px';
    this.rightStyle.height = height + 1 + 'px';
    this.rightStyle.display = 'block';

    if (Handsontable.mobileBrowser || (!this.hasSetting(this.settings.border.cornerVisible) || isPartRange.call(this))) {
      this.cornerStyle.display = 'none';
    }
    else {
      this.cornerStyle.top = top + height - 4 + 'px';
      this.cornerStyle.left = left + width - 4 + 'px';
      this.cornerStyle.borderRightWidth = this.cornerDefaultStyle.borderWidth;
      this.cornerStyle.width = this.cornerDefaultStyle.width;
      this.cornerStyle.display = 'block';

      if (toColumn === this.instance.getSetting('totalColumns') - 1) {
        var trimmingContainer = Handsontable.Dom.getTrimmingContainer(instance.wtTable.TABLE),
            cornerOverlappingContainer = toTD.offsetLeft + Handsontable.Dom.outerWidth(toTD) >= Handsontable.Dom.innerWidth(trimmingContainer);

        if (cornerOverlappingContainer) {
          this.cornerStyle.left = Math.floor(left + width - 3 - parseInt(this.cornerDefaultStyle.width) / 2) + "px";
          this.cornerStyle.borderRightWidth = 0;
        }
      }
    }

    if (Handsontable.mobileBrowser) {
      updateMultipleSelectionHandlesPosition.call(this, top, left, width, height);
    }
  };

  /**
   * Hide border
   */
  WalkontableBorder.prototype.disappear = function () {
    this.topStyle.display = 'none';
    this.leftStyle.display = 'none';
    this.bottomStyle.display = 'none';
    this.rightStyle.display = 'none';
    this.cornerStyle.display = 'none';

    if(Handsontable.mobileBrowser) {
      this.selectionHandles.styles.topLeft.display = 'none';
      this.selectionHandles.styles.bottomRight.display = 'none';
    }


  };

  WalkontableBorder.prototype.hasSetting = function (setting) {
    if (typeof setting === 'function') {
      return setting();
    }
    return !!setting;
  };

  /**
   * WalkontableCellCoords holds cell coordinates (row, column) and few metiod to validate them and retrieve as an array or an object
   * TODO: change interface to WalkontableCellCoords(row, col) everywhere, remove those unnecessary setter and getter functions
   */

  function WalkontableCellCoords(row, col) {
    if (typeof row !== 'undefined' && typeof col !== 'undefined') {
      this.row = row;
      this.col = col;
    }
    else {
      this.row = null;
      this.col = null;
    }
  }

  /**
   * Returns boolean information if given set of coordinates is valid in context of a given Walkontable instance
   *
   * @param instance
   * @returns {boolean}
   */
  WalkontableCellCoords.prototype.isValid = function (instance) {
    //is it a valid cell index (0 or higher)
    if (this.row < 0 || this.col < 0) {
      return false;
    }

    //is selection within total rows and columns
    if (this.row >= instance.getSetting('totalRows') || this.col >= instance.getSetting('totalColumns')) {
      return false;
    }

    return true;
  };

  /**
   * Returns boolean information if this cell coords are the same as cell coords given as a parameter
   *
   * @param {WalkontableCellCoords} cellCoords
   * @returns {boolean}
   */
  WalkontableCellCoords.prototype.isEqual = function (cellCoords) {
    if (cellCoords === this) {
      return true;
    }
    return (this.row === cellCoords.row && this.col === cellCoords.col);
  };

  WalkontableCellCoords.prototype.isSouthEastOf = function (testedCoords) {
    return this.row >= testedCoords.row && this.col >= testedCoords.col;
  };

  WalkontableCellCoords.prototype.isNorthWestOf = function (testedCoords) {
    return this.row <= testedCoords.row && this.col <= testedCoords.col;
  };

  WalkontableCellCoords.prototype.isSouthWestOf = function (testedCoords) {
    return this.row >= testedCoords.row && this.col <= testedCoords.col;
  };

  WalkontableCellCoords.prototype.isNorthEastOf = function (testedCoords) {
    return this.row <= testedCoords.row && this.col >= testedCoords.col;
  };

  window.WalkontableCellCoords = WalkontableCellCoords; //export

  /**
   * A cell range is a set of exactly two WalkontableCellCoords (that can be the same or different)
   */

  function WalkontableCellRange(highlight, from, to) {
    this.highlight = highlight; //this property is used to draw bold border around a cell where selection was started and to edit the cell when you press Enter
    this.from = from; //this property is usually the same as highlight, but in Excel there is distinction - one can change highlight within a selection
    this.to = to;
  }

  WalkontableCellRange.prototype.isValid = function (instance) {
    return (this.from.isValid(instance) && this.to.isValid(instance));
  };

  WalkontableCellRange.prototype.isSingle = function () {
    return (this.from.row === this.to.row && this.from.col === this.to.col);
  };

  /**
   * Returns selected range height (in number of rows)
   *
   * @returns {number}
   */
  WalkontableCellRange.prototype.getHeight = function () {
    return Math.max(this.from.row, this.to.row) - Math.min(this.from.row, this.to.row) + 1;
  };

  /**
   * Returns selected range width (in number of columns)
   *
   * @returns {number}
   */
  WalkontableCellRange.prototype.getWidth = function () {
    return Math.max(this.from.col, this.to.col) - Math.min(this.from.col, this.to.col) + 1;
  };

  /**
   * Returns boolean information if given cell coords is within `from` and `to` cell coords of this range
   *
   * @param {WalkontableCellCoords} cellCoords
   * @returns {boolean}
   */
  WalkontableCellRange.prototype.includes = function (cellCoords) {
    var topLeft = this.getTopLeftCorner();
    var bottomRight = this.getBottomRightCorner();

    if (cellCoords.row < 0) {
      cellCoords.row = 0;
    }

    if (cellCoords.col < 0) {
      cellCoords.col = 0;
    }

    return (topLeft.row <= cellCoords.row && bottomRight.row >= cellCoords.row && topLeft.col <= cellCoords.col && bottomRight.col >= cellCoords.col);
  };

  WalkontableCellRange.prototype.includesRange = function (testedRange) {
    return this.includes(testedRange.getTopLeftCorner()) && this.includes(testedRange.getBottomRightCorner());
  };

  WalkontableCellRange.prototype.isEqual = function (testedRange) {
    return (Math.min(this.from.row, this.to.row) == Math.min(testedRange.from.row, testedRange.to.row)) &&
        (Math.max(this.from.row, this.to.row) == Math.max(testedRange.from.row, testedRange.to.row)) &&
        (Math.min(this.from.col, this.to.col) == Math.min(testedRange.from.col, testedRange.to.col)) &&
        (Math.max(this.from.col, this.to.col) == Math.max(testedRange.from.col, testedRange.to.col));
  };

  /**
   * Returns true if tested range overlaps with the range.
   * Range A is considered to to be overlapping with range B if intersection of A and B or B and A is not empty.
   *
   * @param testedRange
   * @returns {boolean}
   */
  WalkontableCellRange.prototype.overlaps = function (testedRange) {
    return testedRange.isSouthEastOf(this.getTopLeftCorner()) && testedRange.isNorthWestOf(this.getBottomRightCorner());
  };

  WalkontableCellRange.prototype.isSouthEastOf = function (testedCoords) {
    return this.getTopLeftCorner().isSouthEastOf(testedCoords) || this.getBottomRightCorner().isSouthEastOf(testedCoords);
  };

  WalkontableCellRange.prototype.isNorthWestOf = function (testedCoords) {
    return this.getTopLeftCorner().isNorthWestOf(testedCoords) || this.getBottomRightCorner().isNorthWestOf(testedCoords);
  };

  /**
   * Adds a cell to a range (only if exceeds corners of the range). Returns information if range was expanded
   *
   * @param {WalkontableCellCoords} cellCoords
   * @returns {boolean}
   */
  WalkontableCellRange.prototype.expand = function (cellCoords) {
    var topLeft = this.getTopLeftCorner();
    var bottomRight = this.getBottomRightCorner();
    if (cellCoords.row < topLeft.row || cellCoords.col < topLeft.col || cellCoords.row > bottomRight.row || cellCoords.col > bottomRight.col) {
      this.from = new WalkontableCellCoords(Math.min(topLeft.row, cellCoords.row), Math.min(topLeft.col, cellCoords.col));
      this.to = new WalkontableCellCoords(Math.max(bottomRight.row, cellCoords.row), Math.max(bottomRight.col, cellCoords.col));
      return true;
    }
    return false;
  };

  WalkontableCellRange.prototype.expandByRange = function (expandingRange) {
    if (this.includesRange(expandingRange) || !this.overlaps(expandingRange)) {
      return false;
    }

    var topLeft = this.getTopLeftCorner()
        , bottomRight = this.getBottomRightCorner()
        , topRight = this.getTopRightCorner()
        , bottomLeft = this.getBottomLeftCorner();

    var expandingTopLeft = expandingRange.getTopLeftCorner();
    var expandingBottomRight = expandingRange.getBottomRightCorner();

    var resultTopRow = Math.min(topLeft.row, expandingTopLeft.row);
    var resultTopCol = Math.min(topLeft.col, expandingTopLeft.col);
    var resultBottomRow = Math.max(bottomRight.row, expandingBottomRight.row);
    var resultBottomCol = Math.max(bottomRight.col, expandingBottomRight.col);

    var finalFrom = new WalkontableCellCoords(resultTopRow, resultTopCol)
        , finalTo = new WalkontableCellCoords(resultBottomRow, resultBottomCol);
    var isCorner = new WalkontableCellRange(finalFrom, finalFrom, finalTo).isCorner(this.from, expandingRange)
        , onlyMerge = expandingRange.isEqual(new WalkontableCellRange(finalFrom, finalFrom, finalTo));

    if (isCorner && !onlyMerge) {
      if (this.from.col > finalFrom.col) {
        finalFrom.col = resultBottomCol;
        finalTo.col = resultTopCol;
      }
      if (this.from.row > finalFrom.row) {
        finalFrom.row = resultBottomRow;
        finalTo.row = resultTopRow;
      }
    }

    this.from = finalFrom;
    this.to = finalTo;

    return true;
  };

  WalkontableCellRange.prototype.getDirection = function () {
    if (this.from.isNorthWestOf(this.to)) {        // NorthWest - SouthEast
      return "NW-SE";
    } else if (this.from.isNorthEastOf(this.to)) { // NorthEast - SouthWest
      return "NE-SW";
    } else if (this.from.isSouthEastOf(this.to)) { // SouthEast - NorthWest
      return "SE-NW";
    } else if (this.from.isSouthWestOf(this.to)) { // SouthWest - NorthEast
      return "SW-NE";
    }
  };

  WalkontableCellRange.prototype.setDirection = function (direction) {
    switch (direction) {
      case "NW-SE" :
        this.from = this.getTopLeftCorner();
        this.to = this.getBottomRightCorner();
        break;
      case "NE-SW" :
        this.from = this.getTopRightCorner();
        this.to = this.getBottomLeftCorner();
        break;
      case "SE-NW" :
        this.from = this.getBottomRightCorner();
        this.to = this.getTopLeftCorner();
        break;
      case "SW-NE" :
        this.from = this.getBottomLeftCorner();
        this.to = this.getTopRightCorner();
        break;
    }
  };

  WalkontableCellRange.prototype.getTopLeftCorner = function () {
    return new WalkontableCellCoords(Math.min(this.from.row, this.to.row), Math.min(this.from.col, this.to.col));
  };

  WalkontableCellRange.prototype.getBottomRightCorner = function () {
    return new WalkontableCellCoords(Math.max(this.from.row, this.to.row), Math.max(this.from.col, this.to.col));
  };

  WalkontableCellRange.prototype.getTopRightCorner = function () {
    return new WalkontableCellCoords(Math.min(this.from.row, this.to.row), Math.max(this.from.col, this.to.col));
  };

  WalkontableCellRange.prototype.getBottomLeftCorner = function () {
    return new WalkontableCellCoords(Math.max(this.from.row, this.to.row), Math.min(this.from.col, this.to.col));
  };

  WalkontableCellRange.prototype.isCorner = function (coords, expandedRange) {
    if (expandedRange) {
      if (expandedRange.includes(coords)) {
        if (this.getTopLeftCorner().isEqual(new WalkontableCellCoords(expandedRange.from.row, expandedRange.from.col)) ||
            this.getTopRightCorner().isEqual(new WalkontableCellCoords(expandedRange.from.row, expandedRange.to.col)) ||
            this.getBottomLeftCorner().isEqual(new WalkontableCellCoords(expandedRange.to.row, expandedRange.from.col)) ||
            this.getBottomRightCorner().isEqual(new WalkontableCellCoords(expandedRange.to.row, expandedRange.to.col))) {
          return true;
        }
      }
    }
    return coords.isEqual(this.getTopLeftCorner()) || coords.isEqual(this.getTopRightCorner()) || coords.isEqual(this.getBottomLeftCorner()) || coords.isEqual(this.getBottomRightCorner());
  };

  WalkontableCellRange.prototype.getOppositeCorner = function (coords, expandedRange) {
    if (!(coords instanceof WalkontableCellCoords)) {
      return false;
    }

    if (expandedRange) {
      if (expandedRange.includes(coords)) {
        if (this.getTopLeftCorner().isEqual(new WalkontableCellCoords(expandedRange.from.row, expandedRange.from.col))) {
          return this.getBottomRightCorner();
        }
        if (this.getTopRightCorner().isEqual(new WalkontableCellCoords(expandedRange.from.row, expandedRange.to.col))) {
          return this.getBottomLeftCorner();
        }
        if (this.getBottomLeftCorner().isEqual(new WalkontableCellCoords(expandedRange.to.row, expandedRange.from.col))) {
          return this.getTopRightCorner();
        }
        if (this.getBottomRightCorner().isEqual(new WalkontableCellCoords(expandedRange.to.row, expandedRange.to.col))) {
          return this.getTopLeftCorner();
        }
      }
    }

    if (coords.isEqual(this.getBottomRightCorner())) {
      return this.getTopLeftCorner();
    } else if (coords.isEqual(this.getTopLeftCorner())) {
      return this.getBottomRightCorner();
    } else if (coords.isEqual(this.getTopRightCorner())) {
      return this.getBottomLeftCorner();
    } else if (coords.isEqual(this.getBottomLeftCorner())) {
      return  this.getTopRightCorner();
    }
  };

  WalkontableCellRange.prototype.getBordersSharedWith = function (range) {
    if (!this.includesRange(range)) {
      return [];
    }

    var thisBorders = {
          top: Math.min(this.from.row, this.to.row),
          bottom: Math.max(this.from.row, this.to.row),
          left: Math.min(this.from.col, this.to.col),
          right: Math.max(this.from.col, this.to.col)
        }
        , rangeBorders = {
          top: Math.min(range.from.row, range.to.row),
          bottom: Math.max(range.from.row, range.to.row),
          left: Math.min(range.from.col, range.to.col),
          right: Math.max(range.from.col, range.to.col)
        }
        , result = [];

    if (thisBorders.top == rangeBorders.top) {
      result.push('top');
    }
    if (thisBorders.right == rangeBorders.right) {
      result.push('right');
    }
    if (thisBorders.bottom == rangeBorders.bottom) {
      result.push('bottom');
    }
    if (thisBorders.left == rangeBorders.left) {
      result.push('left');
    }

    return result;
  };

  WalkontableCellRange.prototype.getInner = function () {
    var topLeft = this.getTopLeftCorner();
    var bottomRight = this.getBottomRightCorner();
    var out = [];
    for (var r = topLeft.row; r <= bottomRight.row; r++) {
      for (var c = topLeft.col; c <= bottomRight.col; c++) {
        if (!(this.from.row === r && this.from.col === c) && !(this.to.row === r && this.to.col === c)) {
          out.push(new WalkontableCellCoords(r, c));
        }
      }
    }
    return out;
  };

  WalkontableCellRange.prototype.getAll = function () {
    var topLeft = this.getTopLeftCorner();
    var bottomRight = this.getBottomRightCorner();
    var out = [];
    for (var r = topLeft.row; r <= bottomRight.row; r++) {
      for (var c = topLeft.col; c <= bottomRight.col; c++) {
        if (topLeft.row === r && topLeft.col === c) {
          out.push(topLeft);
        }
        else if (bottomRight.row === r && bottomRight.col === c) {
          out.push(bottomRight);
        }
        else {
          out.push(new WalkontableCellCoords(r, c));
        }
      }
    }
    return out;
  };

  /**
   * Runs a callback function against all cells in the range. You can break the iteration by returning false in the callback function
   *
   * @param callback {Function}
   */
  WalkontableCellRange.prototype.forAll = function (callback) {
    var topLeft = this.getTopLeftCorner();
    var bottomRight = this.getBottomRightCorner();
    for (var r = topLeft.row; r <= bottomRight.row; r++) {
      for (var c = topLeft.col; c <= bottomRight.col; c++) {
        var breakIteration = callback(r, c);
        if (breakIteration === false) {
          return;
        }
      }
    }
  };

  window.WalkontableCellRange = WalkontableCellRange; //export

  /**
   * WalkontableColumnFilter
   *
   * @constructor
   * @private
   */
  function WalkontableColumnFilter(offset,total, countTH) {
    this.offset = offset;
    this.total = total;
    this.countTH = countTH;
  }

  WalkontableColumnFilter.prototype.offsetted = function (n) {
    return n + this.offset;
  };

  WalkontableColumnFilter.prototype.unOffsetted = function (n) {
    return n - this.offset;
  };

  WalkontableColumnFilter.prototype.renderedToSource = function (n) {
    return this.offsetted(n);
  };

  WalkontableColumnFilter.prototype.sourceToRendered = function (n) {
    return this.unOffsetted(n);
  };

  WalkontableColumnFilter.prototype.offsettedTH = function (n) {
    return n - this.countTH;
  };

  WalkontableColumnFilter.prototype.unOffsettedTH = function (n) {
    return n + this.countTH;
  };

  WalkontableColumnFilter.prototype.visibleRowHeadedColumnToSourceColumn = function (n) {
    return this.renderedToSource(this.offsettedTH(n));
  };

  WalkontableColumnFilter.prototype.sourceColumnToVisibleRowHeadedColumn = function (n) {
    return this.unOffsettedTH(this.sourceToRendered(n));
  };

  /**
   * WalkontableColumnStrategy
   *
   * @param containerSizeFn
   * @param sizeAtIndex
   * @param strategy - all, last, none
   * @constructor
   * @private
   */
  function WalkontableColumnStrategy(instance, containerSizeFn, sizeAtIndex, strategy) {
    var size
        , i = 0;

    this.instance = instance;
    this.containerSizeFn = containerSizeFn;
    this.cellSizesSum = 0;
    this.cellSizes = [];
    this.cellStretch = [];
    this.cellCount = 0;
    this.visibleCellCount = 0;
    this.remainingSize = 0;
    this.strategy = strategy;

    //step 1 - determine cells that fit containerSize and cache their widths
    while (true) {
      size = sizeAtIndex(i);
      if (size === void 0) {
        break; //total columns exceeded
      }
      if (this.cellSizesSum < this.getContainerSize()) {
        this.visibleCellCount++;
      }
      this.cellSizes.push(size);
      this.cellSizesSum += size;
      this.cellCount++;

      i++;
    }

    var containerSize = this.getContainerSize();
    this.remainingSize = this.cellSizesSum - containerSize;
    //negative value means the last cell is fully visible and there is some space left for stretching
    //positive value means the last cell is not fully visible
  }

  WalkontableColumnStrategy.prototype.getContainerSize = function () {
    return typeof this.containerSizeFn === 'function' ? this.containerSizeFn() : this.containerSizeFn;
  };

  WalkontableColumnStrategy.prototype.getSize = function (index) {
    return this.cellSizes[index] + (this.cellStretch[index] || 0);
  };

  WalkontableColumnStrategy.prototype.stretch = function () {
    //step 2 - apply stretching strategy
    var containerSize = this.getContainerSize()
        , i = 0;

    this.remainingSize = this.cellSizesSum - containerSize;

    this.cellStretch.length = 0; //clear previous stretch

    if (this.strategy === 'all') {
      if (this.remainingSize < 0) {
        var ratio = containerSize / this.cellSizesSum;
        var newSize;

        while (i < this.cellCount - 1) { //"i < this.cellCount - 1" is needed because last cellSize is adjusted after the loop
          newSize = Math.floor(ratio * this.cellSizes[i]);
          this.remainingSize += newSize - this.cellSizes[i];
          this.cellStretch[i] = newSize - this.cellSizes[i];
          i++;
        }
        this.cellStretch[this.cellCount - 1] = -this.remainingSize;
        this.remainingSize = 0;
      }
    }
    else if (this.strategy === 'last') {
      if (this.remainingSize < 0 && containerSize !== Infinity) { //Infinity is with native scroll when the table is wider than the viewport (TODO: test)
        this.cellStretch[this.cellCount - 1] = -this.remainingSize;
        this.remainingSize = 0;
      }
    }
  };

  WalkontableColumnStrategy.prototype.countVisible = function () {
    return this.visibleCellCount;
  };

  WalkontableColumnStrategy.prototype.isLastIncomplete = function () {

    var firstRow = this.instance.wtTable.getFirstVisibleRow();
    var lastCol = this.instance.wtTable.getLastVisibleColumn();
    var cell = this.instance.wtTable.getCell(new WalkontableCellCoords(firstRow, lastCol));
    var cellOffset = Handsontable.Dom.offset(cell);
    var cellWidth = Handsontable.Dom.outerWidth(cell);
    var cellEnd = cellOffset.left + cellWidth;

    var viewportOffsetLeft = this.instance.wtOverlays.topOverlay.getScrollPosition();
    var viewportWitdh = this.instance.wtViewport.getViewportWidth();
    var viewportEnd = viewportOffsetLeft + viewportWitdh;


    return viewportEnd >= cellEnd;
  };

  function Walkontable(settings) {
    var originalHeaders = [];

    this.guid = 'wt_' + walkontableRandomString(); //this is the namespace for global events

    //bootstrap from settings
    if (settings.cloneSource) {
      this.cloneSource = settings.cloneSource;
      this.cloneOverlay = settings.cloneOverlay;
      this.wtSettings = settings.cloneSource.wtSettings;
      this.wtTable = new WalkontableTable(this, settings.table, settings.wtRootElement);
      this.wtScroll = new WalkontableScroll(this);
      this.wtViewport = settings.cloneSource.wtViewport;
      this.wtEvent = new WalkontableEvent(this);
      this.selections = this.cloneSource.selections;
    }
    else {
      this.wtSettings = new WalkontableSettings(this, settings);
      this.wtTable = new WalkontableTable(this, settings.table);
      this.wtScroll = new WalkontableScroll(this);
      this.wtViewport = new WalkontableViewport(this);
      this.wtEvent = new WalkontableEvent(this);
      this.selections = this.getSetting('selections');

      this.wtOverlays = new WalkontableOverlays(this);
    }

    //find original headers
    if (this.wtTable.THEAD.childNodes.length && this.wtTable.THEAD.childNodes[0].childNodes.length) {
      for (var c = 0, clen = this.wtTable.THEAD.childNodes[0].childNodes.length; c < clen; c++) {
        originalHeaders.push(this.wtTable.THEAD.childNodes[0].childNodes[c].innerHTML);
      }
      if (!this.getSetting('columnHeaders').length) {
        this.update('columnHeaders', [function (column, TH) {
          Handsontable.Dom.fastInnerText(TH, originalHeaders[column]);
        }]);
      }
    }



    this.drawn = false;
    this.drawInterrupted = false;
  }

  /**
   * Force rerender of Walkontable
   *
   * @param fastDraw {Boolean} When TRUE, try to refresh only the positions of borders without rerendering the data.
   *                           It will only work if WalkontableTable.draw() does not force rendering anyway
   * @returns {Walkontable}
   */
  Walkontable.prototype.draw = function (fastDraw) {
    this.drawInterrupted = false;
    if (!fastDraw && !Handsontable.Dom.isVisible(this.wtTable.TABLE)) {
      this.drawInterrupted = true; //draw interrupted because TABLE is not visible
      return;
    }

    this.wtTable.draw(fastDraw);

    return this;
  };

  /**
   * Returns the TD at coords. If topmost is set to true, returns TD from the topmost overlay layer,
   * if not set or set to false, returns TD from the master table.
   *
   * @param {WalkontableCellCoords} coords
   * @param {Boolean} topmost
   * @returns {Object}
   */
  Walkontable.prototype.getCell = function (coords, topmost) {
    if(!topmost) {
      return this.wtTable.getCell(coords);
    } else {
      var fixedRows = this.wtSettings.getSetting('fixedRowsTop')
          , fixedColumns = this.wtSettings.getSetting('fixedColumnsLeft');

      if(coords.row < fixedRows && coords.col < fixedColumns) {
        return this.wtOverlays.topLeftCornerOverlay.clone.wtTable.getCell(coords);
      } else if(coords.row < fixedRows) {
        return this.wtOverlays.topOverlay.clone.wtTable.getCell(coords);
      } else if (coords.col < fixedColumns) {
        return this.wtOverlays.leftOverlay.clone.wtTable.getCell(coords);
      } else {
        return this.wtTable.getCell(coords);
      }
    }
  };

  Walkontable.prototype.update = function (settings, value) {
    return this.wtSettings.update(settings, value);
  };

  /**
   * Scroll the viewport to a row at the given index in the data source
   *
   * @param row
   * @returns {Walkontable}
   */
  Walkontable.prototype.scrollVertical = function (row) {
    this.wtOverlays.topOverlay.scrollTo(row);
    this.getSetting('onScrollVertically');
    return this;
  };

  /**
   * Scroll the viewport to a column at the given index in the data source
   *
   * @param column
   * @returns {Walkontable}
   */
  Walkontable.prototype.scrollHorizontal = function (column) {
    this.wtOverlays.leftOverlay.scrollTo(column);
    this.getSetting('onScrollHorizontally');
    return this;
  };

  /**
   * Scrolls the viewport to a cell (rerenders if needed)
   *
   * @param {WalkontableCellCoords} coords
   * @returns {Walkontable}
   */

  Walkontable.prototype.scrollViewport = function (coords) {
    this.wtScroll.scrollViewport(coords);
    return this;
  };

  Walkontable.prototype.getViewport = function () {
    return [
      this.wtTable.getFirstVisibleRow(),
      this.wtTable.getFirstVisibleColumn(),
      this.wtTable.getLastVisibleRow(),
      this.wtTable.getLastVisibleColumn()
    ];
  };

  Walkontable.prototype.getSetting = function (key, param1, param2, param3, param4) {
    return this.wtSettings.getSetting(key, param1, param2, param3, param4); //this is faster than .apply - https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips
  };

  Walkontable.prototype.hasSetting = function (key) {
    return this.wtSettings.has(key);
  };

  Walkontable.prototype.destroy = function () {
    this.wtOverlays.destroy();

    if ( this.wtEvent ) {
      this.wtEvent.destroy();
    }
  };

  /**
   * A overlay that renders ALL available rows & columns positioned on top of the original Walkontable instance and all other overlays.
   * Used for debugging purposes to see if the other overlays (that render only part of the rows & columns) are positioned correctly
   *
   * @param instance
   * @constructor
   * @private
   */
  function WalkontableDebugOverlay(instance) {
    this.instance = instance;
    this.init();
    this.clone = this.makeClone('debug');
    this.clone.wtTable.holder.style.opacity = 0.4;
    this.clone.wtTable.holder.style.textShadow = '0 0 2px #ff0000';
    this.lastTimeout = null;

    Handsontable.Dom.addClass(this.clone.wtTable.holder.parentNode, 'wtDebugVisible');

    /*var that = this;
     var lastX = 0;
     var lastY = 0;
     var overlayContainer = that.clone.wtTable.holder.parentNode;

     var eventManager = Handsontable.eventManager(instance);

     eventManager.addEventListener(document.body, 'mousemove', function (event) {
     if (!that.instance.wtTable.holder.parentNode) {
     return; //removed from DOM
     }
     if ((event.clientX - lastX > -5 && event.clientX - lastX < 5) && (event.clientY - lastY > -5 && event.clientY - lastY < 5)) {
     return; //ignore minor mouse movement
     }
     lastX = event.clientX;
     lastY = event.clientY;
     Handsontable.Dom.addClass(overlayContainer, 'wtDebugHidden');
     Handsontable.Dom.removeClass(overlayContainer, 'wtDebugVisible');
     clearTimeout(this.lastTimeout);
     this.lastTimeout = setTimeout(function () {
     Handsontable.Dom.removeClass(overlayContainer, 'wtDebugHidden');
     Handsontable.Dom.addClass(overlayContainer, 'wtDebugVisible');
     }, 1000);
     });*/
  }

  WalkontableDebugOverlay.prototype = new WalkontableOverlay();

  WalkontableDebugOverlay.prototype.destroy = function () {
    WalkontableOverlay.prototype.destroy.call(this);
    clearTimeout(this.lastTimeout);
  };

  function WalkontableEvent(instance) {
    var that = this;

    var eventManager = Handsontable.eventManager(instance);

    //reference to instance
    this.instance = instance;

    var dblClickOrigin = [null, null];
    this.dblClickTimeout = [null, null];

    var onMouseDown = function (event) {
      var cell = that.parentCell(event.realTarget);

      if (Handsontable.Dom.hasClass(event.realTarget, 'corner')) {
        that.instance.getSetting('onCellCornerMouseDown', event, event.realTarget);
      }
      else if (cell.TD) {
        if (that.instance.hasSetting('onCellMouseDown')) {
          that.instance.getSetting('onCellMouseDown', event, cell.coords, cell.TD, that.instance);
        }
      }

      if (event.button !== 2) { //if not right mouse button
        if (cell.TD) {
          dblClickOrigin[0] = cell.TD;
          clearTimeout(that.dblClickTimeout[0]);
          that.dblClickTimeout[0] = setTimeout(function () {
            dblClickOrigin[0] = null;
          }, 1000);
        }
      }
    };

    var onTouchMove = function (event) {
      that.instance.touchMoving = true;
    };

    var longTouchTimeout;

    ///**
    // * Update touch event target - if user taps on resize handle 'hit area', update the target to the cell itself
    // * @param event
    // */
    /*
     var adjustTapTarget = function (event) {
     var currentSelection
     , properTarget;

     if(Handsontable.Dom.hasClass(event.target,'SelectionHandle')) {
     if(that.instance.selections[0].cellRange) {
     currentSelection = that.instance.selections[0].cellRange.highlight;

     properTarget = that.instance.getCell(currentSelection, true);
     }
     }

     if(properTarget) {
     Object.defineProperty(event,'target',{
     value: properTarget
     });
     }

     return event;
     };*/

    var onTouchStart = function (event) {
      var container = this;

      eventManager.addEventListener(this, 'touchmove', onTouchMove);

      //this.addEventListener("touchmove", onTouchMove, false);

      // touch-and-hold event
      //longTouchTimeout = setTimeout(function () {
      //  if(!that.instance.touchMoving) {
      //    that.instance.longTouch = true;
      //
      //    var targetCoords = Handsontable.Dom.offset(event.target);
      //    var contextMenuEvent = new MouseEvent('contextmenu', {
      //      clientX: targetCoords.left + event.target.offsetWidth,
      //      clientY: targetCoords.top + event.target.offsetHeight,
      //      button: 2
      //    });
      //
      //    that.instance.wtTable.holder.parentNode.parentNode.dispatchEvent(contextMenuEvent);
      //  }
      //},200);

      // Prevent cell selection when scrolling with touch event - not the best solution performance-wise
      that.checkIfTouchMove = setTimeout(function () {
        if (that.instance.touchMoving === true) {
          that.instance.touchMoving = void 0;

          eventManager.removeEventListener("touchmove", onTouchMove, false);

          return;
        } else {
          //event = adjustTapTarget(event);

          onMouseDown(event);
        }
      }, 30);

      //eventManager.removeEventListener(that.instance.wtTable.holder, "mousedown", onMouseDown);
    };

    var lastMouseOver;
    var onMouseOver = function (event) {
      var table, td;

      if (that.instance.hasSetting('onCellMouseOver')) {
        table = that.instance.wtTable.TABLE;
        td = Handsontable.Dom.closest(event.realTarget, ['TD', 'TH'], table);

        if (td && td !== lastMouseOver && Handsontable.Dom.isChildOf(td, table)) {
          lastMouseOver = td;
          that.instance.getSetting('onCellMouseOver', event, that.instance.wtTable.getCoords(td), td, that.instance);
        }
      }
    };

    /*  var lastMouseOut;
     var onMouseOut = function (event) {
     if (that.instance.hasSetting('onCellMouseOut')) {
     var TABLE = that.instance.wtTable.TABLE;
     var TD = Handsontable.Dom.closest(event.target, ['TD', 'TH'], TABLE);
     if (TD && TD !== lastMouseOut && Handsontable.Dom.isChildOf(TD, TABLE)) {
     lastMouseOut = TD;
     if (TD.nodeName === 'TD') {
     that.instance.getSetting('onCellMouseOut', event, that.instance.wtTable.getCoords(TD), TD);
     }
     }
     }
     };*/

    var onMouseUp = function (event) {
      if (event.button !== 2) { //if not right mouse button
        var cell = that.parentCell(event.realTarget);

        if (cell.TD === dblClickOrigin[0] && cell.TD === dblClickOrigin[1]) {
          if (Handsontable.Dom.hasClass(event.realTarget, 'corner')) {
            that.instance.getSetting('onCellCornerDblClick', event, cell.coords, cell.TD, that.instance);
          }
          else {
            that.instance.getSetting('onCellDblClick', event, cell.coords, cell.TD, that.instance);
          }

          dblClickOrigin[0] = null;
          dblClickOrigin[1] = null;
        }
        else if (cell.TD === dblClickOrigin[0]) {
          dblClickOrigin[1] = cell.TD;
          clearTimeout(that.dblClickTimeout[1]);
          that.dblClickTimeout[1] = setTimeout(function () {
            dblClickOrigin[1] = null;
          }, 500);
        }
      }
    };


    var onTouchEnd = function (event) {
      clearTimeout(longTouchTimeout);
      //that.instance.longTouch == void 0;

      event.preventDefault();

      onMouseUp(event);

      //eventManager.removeEventListener(that.instance.wtTable.holder, "mouseup", onMouseUp);
    };

    eventManager.addEventListener(this.instance.wtTable.holder, 'mousedown', onMouseDown);

    eventManager.addEventListener(this.instance.wtTable.TABLE, 'mouseover', onMouseOver);

    eventManager.addEventListener(this.instance.wtTable.holder, 'mouseup', onMouseUp);


    // check if full HOT instance, or detached WOT AND run on mobile device
    if(this.instance.wtTable.holder.parentNode.parentNode && Handsontable.mobileBrowser && !that.instance.wtTable.isWorkingOnClone()) {
      var classSelector = "." + this.instance.wtTable.holder.parentNode.className.split(" ").join(".");

      eventManager.addEventListener(this.instance.wtTable.holder, 'touchstart', function (event) {
        that.instance.touchApplied = true;
        if (Handsontable.Dom.isChildOf(event.target, classSelector)) {
          onTouchStart.call(event.target, event);
        }
      });
      eventManager.addEventListener(this.instance.wtTable.holder, 'touchend', function (event) {
        that.instance.touchApplied = false;
        if (Handsontable.Dom.isChildOf(event.target, classSelector)) {
          onTouchEnd.call(event.target, event);
        }
      });

      if(!that.instance.momentumScrolling) {
        that.instance.momentumScrolling = {};
      }
      eventManager.addEventListener(this.instance.wtTable.holder, 'scroll', function (event) {
        clearTimeout(that.instance.momentumScrolling._timeout);

        if(!that.instance.momentumScrolling.ongoing) {
          that.instance.getSetting('onBeforeTouchScroll');
        }
        that.instance.momentumScrolling.ongoing = true;

        that.instance.momentumScrolling._timeout = setTimeout(function () {
          if(!that.instance.touchApplied) {
            that.instance.momentumScrolling.ongoing = false;

            that.instance.getSetting('onAfterMomentumScroll');
          }
        },200);
      });
    }

    eventManager.addEventListener(window, 'resize', function () {
      that.instance.draw();
    });

    this.destroy = function () {
      clearTimeout(this.dblClickTimeout[0]);
      clearTimeout(this.dblClickTimeout[1]);

      eventManager.clear();
    };
  }

  WalkontableEvent.prototype.parentCell = function (elem) {
    var cell = {};
    var TABLE = this.instance.wtTable.TABLE;
    var TD = Handsontable.Dom.closest(elem, ['TD', 'TH'], TABLE);

    if (TD && Handsontable.Dom.isChildOf(TD, TABLE)) {
      cell.coords = this.instance.wtTable.getCoords(TD);
      cell.TD = TD;
    } else if (Handsontable.Dom.hasClass(elem, 'wtBorder') && Handsontable.Dom.hasClass(elem, 'current')) {
      cell.coords = this.instance.selections.current.cellRange.highlight; //selections.current is current selected cell
      cell.TD = this.instance.wtTable.getCell(cell.coords);
    } else if (Handsontable.Dom.hasClass(elem, 'wtBorder') && Handsontable.Dom.hasClass(elem, 'area')) {
      if (this.instance.selections.area.cellRange) {
        cell.coords = this.instance.selections.area.cellRange.to; //selections.area is area selected cells
        cell.TD = this.instance.wtTable.getCell(cell.coords);
      }
    }

    return cell;
  };



  function walkontableRangesIntersect() {
    var from = arguments[0];
    var to = arguments[1];
    for (var i = 1, ilen = arguments.length / 2; i < ilen; i++) {
      if (from <= arguments[2 * i + 1] && to >= arguments[2 * i]) {
        return true;
      }
    }
    return false;
  }

  /**
   * Generates a random hex string. Used as namespace for Walkontable instance events.
   *
   * @return {String} - 16 character random string: "92b1bfc74ec4"
   */
  function walkontableRandomString() {
    function s4() {
      return Math.floor((1 + Math.random()) * 0x10000)
          .toString(16)
          .substring(1);
    }

    return s4() + s4() + s4() + s4();
  }

  function WalkontableOverlays(instance) {
    this.instance = instance;
    instance.update('scrollbarWidth', Handsontable.Dom.getScrollbarWidth());
    instance.update('scrollbarHeight', Handsontable.Dom.getScrollbarWidth());

    this.topOverlay = new WalkontableTopOverlay(instance);
    this.leftOverlay = new WalkontableLeftOverlay(instance);
    this.topLeftCornerOverlay = new WalkontableCornerOverlay(instance);

    this.preventMultipleScrolling = false;

    if (instance.getSetting('debug')) {
      this.debug = new WalkontableDebugOverlay(instance);
    }
    this.registerListeners();
  }

  WalkontableOverlays.prototype.registerListeners = function () {
    var that = this;
    this.mainTableScrollableElement = Handsontable.Dom.getScrollableElement(this.instance.wtTable.TABLE);

    this.refreshAll = function refreshAll() {
      if (!that.instance.drawn) {
        return;
      }

      if (!that.instance.wtTable.holder.parentNode) {
        //Walkontable was detached from DOM, but this handler was not removed
        that.destroy();
        return;
      }

      that.instance.draw(true);
      that.topOverlay.onScroll();
      that.leftOverlay.onScroll();
    };

    var eventManager = Handsontable.eventManager(that.instance);

    this.requestAnimFrame = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        function (callback) {
          window.setTimeout(callback, 1000 / 60);
        };

    this.overlayScrollPositions = {
      'master': {
        top: 0,
        left: 0
      },
      'top': {
        top: null,
        left: 0
      },
      'left': {
        top: 0,
        left: null
      }
    };

    eventManager.addEventListener(this.mainTableScrollableElement, 'scroll', function (e) {
      that.requestAnimFrame.call(window, function () {
        that.syncScrollPositions(e);
      });
    });

    eventManager.addEventListener(this.topOverlay.clone.wtTable.holder, 'scroll', function (e) {
      that.requestAnimFrame.call(window, function () {
        that.syncScrollPositions(e);
      });
    });

    eventManager.addEventListener(this.topOverlay.clone.wtTable.holder, 'mousewheel', function (e) {
      that.requestAnimFrame.call(window, function () {
        that.translateMouseWheelToScroll(e);
      });
    });

    eventManager.addEventListener(this.leftOverlay.clone.wtTable.holder, 'scroll', function (e) {
      that.requestAnimFrame.call(window, function () {
        that.syncScrollPositions(e);
      });
    });

    eventManager.addEventListener(this.leftOverlay.clone.wtTable.holder, 'mousewheel', function (e) {
      that.requestAnimFrame.call(window, function () {
        that.translateMouseWheelToScroll(e);
      });
    });

    if (this.topOverlay.trimmingContainer !== window && this.leftOverlay.trimmingContainer !== window) {
      eventManager.addEventListener(window, 'scroll', function (e) {
        that.refreshAll();
      });

      eventManager.addEventListener(window, 'mousewheel', function (e) {
        var overlay;

        if (that.topOverlay.clone.wtTable.holder.contains(e.target)) {
          overlay = 'top';
        } else if (that.leftOverlay.clone.wtTable.holder.contains(e.target)) {
          overlay = 'left';
        }

        if (overlay == 'top' && e.wheelDeltaY !== 0) {
          e.preventDefault();
        } else if (overlay == 'left' && e.wheelDeltaX !== 0) {
          e.preventDefault();
        }
      });
    }
  };

  WalkontableOverlays.prototype.translateMouseWheelToScroll = function (e) {
    var topOverlay = this.topOverlay.clone.wtTable.holder,
        leftOverlay = this.leftOverlay.clone.wtTable.holder,
        parentHolder,
        tempElem = e.target,
        eventMockup = {};

    while (tempElem != document && tempElem != null) {
      if (tempElem.className.indexOf('wtHolder') > -1) {
        parentHolder = tempElem;
        break;
      }
      tempElem = tempElem.parentNode;
    }

    eventMockup.target = parentHolder;

    if (parentHolder == topOverlay) {
      this.syncScrollPositions(eventMockup, (-0.2) * e.wheelDeltaY);
    } else if (parentHolder == leftOverlay) {
      this.syncScrollPositions(eventMockup, (-0.2) * e.wheelDeltaX);
    }

    return false;
  };

  WalkontableOverlays.prototype.syncScrollPositions = function (e, fakeScrollValue) {
    if (this.destroyed) {
      return;
    }

    if (this.preventMultipleScrolling) {
      this.preventMultipleScrolling = false;

      return;
    }

    this.preventMultipleScrolling = true;

    var target = e.target,
        master = this.topOverlay.mainTableScrollableElement,
        topOverlay = this.topOverlay.clone.wtTable.holder,
        leftOverlay = this.leftOverlay.clone.wtTable.holder,
        tempScrollValue = 0,
        scrollValueChanged = false;

    if(target === document) {
      target = window;
    }

    if (target === master || target === document) {
      tempScrollValue = Handsontable.Dom.getScrollLeft(target);

      // if scrolling the master table - populate the scroll values to both top and left overlays
      if (this.overlayScrollPositions.master.left !== tempScrollValue) {
        topOverlay.scrollLeft = tempScrollValue;
        this.overlayScrollPositions.master.left = tempScrollValue;
        scrollValueChanged = true;
      }

      tempScrollValue = Handsontable.Dom.getScrollTop(target);

      if (this.overlayScrollPositions.master.top !== tempScrollValue) {
        leftOverlay.scrollTop = tempScrollValue;
        this.overlayScrollPositions.master.top = tempScrollValue;
        scrollValueChanged = true;
      }

    } else if (target === topOverlay) {
      tempScrollValue = Handsontable.Dom.getScrollLeft(target);

      // if scrolling the top overlay - populate the horizontal scroll to the master table
      if (this.overlayScrollPositions.top.left !== tempScrollValue) {
        master.scrollLeft = tempScrollValue;
        this.overlayScrollPositions.top.left = tempScrollValue;
        scrollValueChanged = true;
      }

      // "fake" scroll value calculated from the mousewheel event
      if (fakeScrollValue) {
        master.scrollTop += fakeScrollValue;
      }

    } else if (target === leftOverlay) {
      tempScrollValue = Handsontable.Dom.getScrollTop(target);

      // if scrolling the left overlay - populate the vertical scroll to the master table
      if (this.overlayScrollPositions.left.top !== tempScrollValue) {
        master.scrollTop = tempScrollValue;
        this.overlayScrollPositions.left.top = tempScrollValue;
        scrollValueChanged = true;
      }

      // "fake" scroll value calculated from the mousewheel event
      if (fakeScrollValue) {
        master.scrollLeft += fakeScrollValue;
      }
    }


    if (scrollValueChanged) {
      this.refreshAll();
    } else {
      this.preventMultipleScrolling = false;
    }
  };

  WalkontableOverlays.prototype.destroy = function () {
    var eventManager = Handsontable.eventManager(this.instance);


    if (this.topOverlay) {
      this.topOverlay.destroy();
      eventManager.removeEventListener(this.topOverlay.trimmingContainer, 'scroll', this.refreshAll);
    }
    if (this.leftOverlay) {
      this.leftOverlay.destroy();
      eventManager.removeEventListener(this.leftOverlay.trimmingContainer, 'scroll', this.refreshAll);
    }
    eventManager.removeEventListener(window, 'scroll', this.refreshAll);
    if (this.topLeftCornerOverlay) {
      this.topLeftCornerOverlay.destroy();
    }
    if (this.debug) {
      this.debug.destroy();
    }

    this.destroyed = true;
  };

  WalkontableOverlays.prototype.refresh = function (fastDraw) {
    if (this.leftOverlay) {
      this.leftOverlay.refresh(fastDraw);
    }
    if (this.topOverlay) {
      this.topOverlay.refresh(fastDraw);
    }
    if (this.topLeftCornerOverlay) {
      this.topLeftCornerOverlay.refresh(fastDraw);
    }
    if (this.debug) {
      this.debug.refresh(fastDraw);
    }
  };

  WalkontableOverlays.prototype.applyToDOM = function () {
    if (this.leftOverlay) {
      this.leftOverlay.applyToDOM();
    }
    if (this.topOverlay) {
      this.topOverlay.applyToDOM();
    }
  };

  /**
   * http://notes.jetienne.com/2011/05/18/cancelRequestAnimFrame-for-paul-irish-requestAnimFrame.html
   */
  window.requestAnimFrame = (function () {
    return  window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (/* function */ callback, /* DOMElement */ element) {
          return window.setTimeout(callback, 1000 / 60);
        };
  })();

  window.cancelRequestAnimFrame = (function () {
    return window.cancelAnimationFrame ||
        window.webkitCancelRequestAnimationFrame ||
        window.mozCancelRequestAnimationFrame ||
        window.oCancelRequestAnimationFrame ||
        window.msCancelRequestAnimationFrame ||
        clearTimeout;
  })();

//http://snipplr.com/view/13523/
//modified for speed
//http://jsperf.com/getcomputedstyle-vs-style-vs-css/8
  if (!window.getComputedStyle) {
    (function () {
      var elem;

      var styleObj = {
        getPropertyValue: function getPropertyValue(prop) {
          if (prop == 'float') {
            prop = 'styleFloat';
          }
          return elem.currentStyle[prop.toUpperCase()] || null;
        }
      };

      window.getComputedStyle = function (el) {
        elem = el;
        return styleObj;
      };
    })();
  }

  /**
   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim
   */
  if (!String.prototype.trim) {
    var trimRegex = /^\s+|\s+$/g;
    /* jshint -W121 */
    String.prototype.trim = function () {
      return this.replace(trimRegex, '');
    };
  }

  /**
   * WalkontableRowFilter
   *
   * @constructor
   * @private
   */
  function WalkontableRowFilter(offset, total, countTH) {
    this.offset = offset;
    this.total = total;
    this.countTH = countTH;
  }

  WalkontableRowFilter.prototype.offsetted = function (n) {
    return n + this.offset;
  };

  WalkontableRowFilter.prototype.unOffsetted = function (n) {
    return n - this.offset;
  };

  WalkontableRowFilter.prototype.renderedToSource = function (n) {
    return this.offsetted(n);
  };

  WalkontableRowFilter.prototype.sourceToRendered = function (n) {
    return this.unOffsetted(n);
  };

  WalkontableRowFilter.prototype.offsettedTH = function (n) {
    return n - this.countTH;
  };

  WalkontableRowFilter.prototype.visibleColHeadedRowToSourceRow = function (n) {
    return this.renderedToSource(this.offsettedTH(n));
  };

  WalkontableRowFilter.prototype.sourceRowToVisibleColHeadedRow = function (n) {
    return this.unOffsettedTH(this.sourceToRendered(n));
  };

  function WalkontableScroll(instance) {
    this.instance = instance;
  }

  /**
   * Scrolls viewport to a cell by minimum number of cells
   *
   * @param {WalkontableCellCoords} coords
   */
  WalkontableScroll.prototype.scrollViewport = function (coords) {
    if (!this.instance.drawn) {
      return;
    }

    var totalRows = this.instance.getSetting('totalRows')
        , totalColumns = this.instance.getSetting('totalColumns');

    if (coords.row < 0 || coords.row > totalRows - 1) {
      throw new Error('row ' + coords.row + ' does not exist');
    }

    if (coords.col < 0 || coords.col > totalColumns - 1) {
      throw new Error('column ' + coords.col + ' does not exist');
    }

    if (coords.row > this.instance.wtTable.getLastVisibleRow()) {
      this.instance.wtOverlays.topOverlay.scrollTo(coords.row, true);
    } else if (coords.row >= this.instance.getSetting('fixedRowsTop') && coords.row < this.instance.wtTable.getFirstVisibleRow()){
      this.instance.wtOverlays.topOverlay.scrollTo(coords.row);
    }

    if (coords.col > this.instance.wtTable.getLastVisibleColumn()) {
      this.instance.wtOverlays.leftOverlay.scrollTo(coords.col, true);
    } else if (coords.col >= this.instance.getSetting('fixedColumnsLeft') && coords.col < this.instance.wtTable.getFirstVisibleColumn()){
      this.instance.wtOverlays.leftOverlay.scrollTo(coords.col);
    }

    //}
  };

  function WalkontableHorizontalScrollbarNative(instance) {
    this.instance = instance;
    this.type = 'horizontal';
    this.offset = 0;
    this.init();
    this.clone = this.makeClone('left');
  }

  WalkontableHorizontalScrollbarNative.prototype = new WalkontableOverlay();

//resetFixedPosition (in future merge it with this.refresh?)
  WalkontableHorizontalScrollbarNative.prototype.resetFixedPosition = function () {
    var finalLeft, finalTop;

    if (!this.instance.wtTable.holder.parentNode) {
      return; //removed from DOM
    }
    var elem = this.clone.wtTable.holder.parentNode;

    if (this.scrollHandler === window) {

      var box = this.instance.wtTable.holder.getBoundingClientRect();
      var left = Math.ceil(box.left);
      var right = Math.ceil(box.right);

      if (left < 0 && (right - elem.offsetWidth) > 0) {
        finalLeft = -left + 'px';
      } else {
        finalLeft = '0';
      }

      finalTop = this.instance.wtTable.hider.style.top;
    }
    else if(!Handsontable.freezeOverlays) {
      finalLeft = this.getScrollPosition() + "px";
      finalTop = this.instance.wtTable.hider.style.top;
    }

    Handsontable.Dom.setOverlayPosition(elem, finalLeft, finalTop);

    elem.style.height = Handsontable.Dom.outerHeight(this.clone.wtTable.TABLE) + 'px';
    elem.style.width = Handsontable.Dom.outerWidth(this.clone.wtTable.TABLE) + 4 + 'px';// + 4 + 'px';
  };

  WalkontableHorizontalScrollbarNative.prototype.refresh = function (fastDraw) {
    this.applyToDOM();
    WalkontableOverlay.prototype.refresh.call(this, fastDraw);
  };

  WalkontableHorizontalScrollbarNative.prototype.getScrollPosition = function () {
    return Handsontable.Dom.getScrollLeft(this.scrollHandler);
  };

  WalkontableHorizontalScrollbarNative.prototype.setScrollPosition = function (pos) {
    if (this.scrollHandler === window) {
      window.scrollTo(pos, Handsontable.Dom.getWindowScrollTop());
    } else {
      this.scrollHandler.scrollLeft = pos;
    }
  };

  WalkontableHorizontalScrollbarNative.prototype.onScroll = function () {
    this.instance.getSetting('onScrollHorizontally');
  };

  WalkontableHorizontalScrollbarNative.prototype.sumCellSizes = function (from, length) {
    var sum = 0;
    while(from < length) {
      sum += this.instance.wtTable.getStretchedColumnWidth(from) || this.instance.wtSettings.defaultColumnWidth;
      from++;
    }
    return sum;
  };

//applyToDOM (in future merge it with this.refresh?)
  WalkontableHorizontalScrollbarNative.prototype.applyToDOM = function () {
    var total = this.instance.getSetting('totalColumns');
    var headerSize = this.instance.wtViewport.getRowHeaderWidth();

    this.fixedContainer.style.width = headerSize + this.sumCellSizes(0, total) + 'px';// + 4 + 'px';

    if (typeof this.instance.wtViewport.columnsRenderCalculator.startPosition === 'number'){
      this.fixed.style.left = this.instance.wtViewport.columnsRenderCalculator.startPosition + 'px';
    }
    else if (total === 0) {
      this.fixed.style.left = '0';
    } else {
      throw  new Error('Incorrect value of the columnsRenderCalculator');
    }
    this.fixed.style.right = '';
  };

  /**
   * Scrolls horizontally to a column at the left edge of the viewport
   *
   * @param sourceCol {Number}
   * @param beyondRendered {Boolean} if TRUE, scrolls according to the bottom edge (top edge is by default)
   */
  WalkontableHorizontalScrollbarNative.prototype.scrollTo = function (sourceCol, beyondRendered) {
    var newX = this.getTableParentOffset();

    if (beyondRendered) {
      newX += this.sumCellSizes(0, sourceCol + 1);
      newX -= this.instance.wtViewport.getViewportWidth();
    }
    else {
      var fixedColumnsLeft = this.instance.getSetting('fixedColumnsLeft');
      newX += this.sumCellSizes(fixedColumnsLeft, sourceCol);
    }

    this.setScrollPosition(newX);
  };

  WalkontableHorizontalScrollbarNative.prototype.getTableParentOffset = function () {
    if (this.scrollHandler === window) {
      return this.instance.wtTable.holderOffset.left;
    }
    else {
      return 0;
    }
  };

  function WalkontableSelection(settings, cellRange) {
    this.settings = settings;
    this.cellRange = cellRange || null;
    this.instanceBorders = {};
  }

  /**
   * Each Walkontable clone requires it's own border for every selection. This method creates and returns selection borders per instance
   *
   * @param {Walkontable} instance
   * @returns {WalkontableBorder}
   */
  WalkontableSelection.prototype.getBorder = function (instance) {
    if (this.instanceBorders[instance.guid]) {
      return this.instanceBorders[instance.guid];
    }
    //where is this returned?
    this.instanceBorders[instance.guid] = new WalkontableBorder(instance, this.settings);
  };

  /**
   * Returns boolean information if selection is empty
   *
   * @returns {Boolean}
   */
  WalkontableSelection.prototype.isEmpty = function () {
    return this.cellRange === null;
  };

  /**
   * Adds a cell coords to the selection
   *
   * @param {WalkontableCellCoords} coords
   */
  WalkontableSelection.prototype.add = function (coords) {
    if (this.isEmpty()) {
      this.cellRange = new WalkontableCellRange(coords, coords, coords);
    }
    else {
      this.cellRange.expand(coords);
    }
  };

  /**
   * If selection range from or to property equals oldCoords, replace it with newCoords. Return boolean information about success
   *
   * @param {WalkontableCellCoords} oldCoords
   * @param {WalkontableCellCoords} newCoords
   * @returns {Boolean}
   */
  WalkontableSelection.prototype.replace = function (oldCoords, newCoords) {
    if (!this.isEmpty()) {
      if (this.cellRange.from.isEqual(oldCoords)) {
        this.cellRange.from = newCoords;

        return true;
      }
      if (this.cellRange.to.isEqual(oldCoords)) {
        this.cellRange.to = newCoords;

        return true;
      }
    }

    return false;
  };

  WalkontableSelection.prototype.clear = function () {
    this.cellRange = null;
  };

  /**
   * Returns the top left (TL) and bottom right (BR) selection coordinates
   *
   * @returns {Object}
   */
  WalkontableSelection.prototype.getCorners = function () {
    var
        topLeft = this.cellRange.getTopLeftCorner(),
        bottomRight = this.cellRange.getBottomRightCorner();

    return [topLeft.row, topLeft.col, bottomRight.row, bottomRight.col];
  };

  WalkontableSelection.prototype.addClassAtCoords = function (instance, sourceRow, sourceColumn, cls) {
    var TD = instance.wtTable.getCell(new WalkontableCellCoords(sourceRow, sourceColumn));

    if (typeof TD === 'object') {
      Handsontable.Dom.addClass(TD, cls);
    }
  };

  WalkontableSelection.prototype.draw = function (instance) {
    var
        _this = this,
        renderedRows = instance.wtTable.getRenderedRowsCount(),
        renderedColumns = instance.wtTable.getRenderedColumnsCount(),
        corners, sourceRow, sourceCol, border, TH;

    if (this.isEmpty()) {
      if (this.settings.border) {
        border = this.getBorder(instance);

        if (border) {
          border.disappear();
        }
      }

      return;
    }

    corners = this.getCorners();

    for (var column = 0; column < renderedColumns; column++) {
      sourceCol = instance.wtTable.columnFilter.renderedToSource(column);

      if (sourceCol >= corners[1] && sourceCol <= corners[3]) {
        TH = instance.wtTable.getColumnHeader(sourceCol);

        if (TH && _this.settings.highlightColumnClassName) {
          Handsontable.Dom.addClass(TH, _this.settings.highlightColumnClassName);
        }
      }
    }

    for (var row = 0; row < renderedRows; row++) {
      sourceRow = instance.wtTable.rowFilter.renderedToSource(row);

      if (sourceRow >= corners[0] && sourceRow <= corners[2]) {
        TH = instance.wtTable.getRowHeader(sourceRow);

        if (TH && _this.settings.highlightRowClassName) {
          Handsontable.Dom.addClass(TH, _this.settings.highlightRowClassName);
        }
      }

      for (var column = 0; column < renderedColumns; column++) {
        sourceCol = instance.wtTable.columnFilter.renderedToSource(column);

        if (sourceRow >= corners[0] && sourceRow <= corners[2] && sourceCol >= corners[1] && sourceCol <= corners[3]) {
          // selected cell
          if (_this.settings.className) {
            _this.addClassAtCoords(instance, sourceRow, sourceCol, _this.settings.className);
          }
        }
        else if (sourceRow >= corners[0] && sourceRow <= corners[2]) {
          // selection is in this row
          if (_this.settings.highlightRowClassName) {
            _this.addClassAtCoords(instance, sourceRow, sourceCol, _this.settings.highlightRowClassName);
          }
        }
        else if (sourceCol >= corners[1] && sourceCol <= corners[3]) {
          // selection is in this column
          if (_this.settings.highlightColumnClassName) {
            _this.addClassAtCoords(instance, sourceRow, sourceCol, _this.settings.highlightColumnClassName);
          }
        }
      }
    }

    instance.getSetting('onBeforeDrawBorders', corners, this.settings.className);

    if (this.settings.border) {
      border = this.getBorder(instance);

      if (border) {
        // warning! border.appear modifies corners!
        border.appear(corners);
      }
    }
  };

  function WalkontableSettings(instance, settings) {
    var that = this;
    this.instance = instance;

    //default settings. void 0 means it is required, null means it can be empty
    this.defaults = {
      table: void 0,
      debug: false, //shows WalkontableDebugOverlay

      //presentation mode
      stretchH: 'none', //values: all, last, none
      currentRowClassName: null,
      currentColumnClassName: null,

      //data source
      data: void 0,
      fixedColumnsLeft: 0,
      fixedRowsTop: 0,
      rowHeaders: function () {
        return [];
      }, //this must be array of functions: [function (row, TH) {}]
      columnHeaders: function () {
        return [];
      }, //this must be array of functions: [function (column, TH) {}]
      totalRows: void 0,
      totalColumns: void 0,
      cellRenderer: function (row, column, TD) {
        var cellData = that.getSetting('data', row, column);
        Handsontable.Dom.fastInnerText(TD, cellData === void 0 || cellData === null ? '' : cellData);
      },
      //columnWidth: 50,
      columnWidth: function (col) {
        return; //return undefined means use default size for the rendered cell content
      },
      rowHeight: function (row) {
        return; //return undefined means use default size for the rendered cell content
      },
      defaultRowHeight: 23,
      defaultColumnWidth: 50,
      selections: null,
      hideBorderOnMouseDownOver: false,
      viewportRowCalculatorOverride: null,
      viewportColumnCalculatorOverride: null,

      //callbacks
      onCellMouseDown: null,
      onCellMouseOver: null,
//    onCellMouseOut: null,
      onCellDblClick: null,
      onCellCornerMouseDown: null,
      onCellCornerDblClick: null,
      beforeDraw: null,
      onDraw: null,
      onBeforeDrawBorders: null,
      onScrollVertically: null,
      onScrollHorizontally: null,
      onBeforeTouchScroll: null,
      onAfterMomentumScroll: null,

      //constants
      scrollbarWidth: 10,
      scrollbarHeight: 10,

      renderAllRows: false,
      groups: false
    };

    //reference to settings
    this.settings = {};
    for (var i in this.defaults) {
      if (this.defaults.hasOwnProperty(i)) {
        if (settings[i] !== void 0) {
          this.settings[i] = settings[i];
        }
        else if (this.defaults[i] === void 0) {
          throw new Error('A required setting "' + i + '" was not provided');
        }
        else {
          this.settings[i] = this.defaults[i];
        }
      }
    }
  }

  /**
   * generic methods
   */
  WalkontableSettings.prototype.update = function (settings, value) {
    if (value === void 0) { //settings is object
      for (var i in settings) {
        if (settings.hasOwnProperty(i)) {
          this.settings[i] = settings[i];
        }
      }
    }
    else { //if value is defined then settings is the key
      this.settings[settings] = value;
    }
    return this.instance;
  };

  WalkontableSettings.prototype.getSetting = function (key, param1, param2, param3, param4) {
    if (typeof this.settings[key] === 'function') {
      return this.settings[key](param1, param2, param3, param4); //this is faster than .apply - https://github.com/handsontable/handsontable/wiki/JavaScript-&-DOM-performance-tips
    }
    else if (param1 !== void 0 && Array.isArray(this.settings[key])) { //perhaps this can be removed, it is only used in tests
      return this.settings[key][param1];
    }
    else {
      return this.settings[key];
    }
  };

  WalkontableSettings.prototype.has = function (key) {
    return !!this.settings[key];
  };

  function WalkontableTable(instance, table) {
    //reference to instance
    this.instance = instance;
    this.TABLE = table;
    Handsontable.Dom.removeTextNodes(this.TABLE);

    //wtSpreader
    var parent = this.TABLE.parentNode;
    if (!parent || parent.nodeType !== 1 || !Handsontable.Dom.hasClass(parent, 'wtHolder')) {
      var spreader = document.createElement('DIV');
      spreader.className = 'wtSpreader';
      if (parent) {
        parent.insertBefore(spreader, this.TABLE); //if TABLE is detached (e.g. in Jasmine test), it has no parentNode so we cannot attach holder to it
      }
      spreader.appendChild(this.TABLE);
    }
    this.spreader = this.TABLE.parentNode;
    this.spreader.style.position = 'relative';

    //wtHider
    parent = this.spreader.parentNode;
    if (!parent || parent.nodeType !== 1 || !Handsontable.Dom.hasClass(parent, 'wtHolder')) {
      var hider = document.createElement('DIV');
      hider.className = 'wtHider';
      if (parent) {
        parent.insertBefore(hider, this.spreader); //if TABLE is detached (e.g. in Jasmine test), it has no parentNode so we cannot attach holder to it
      }
      hider.appendChild(this.spreader);
    }
    this.hider = this.spreader.parentNode;

    //wtHolder
    parent = this.hider.parentNode;
    if (!parent || parent.nodeType !== 1 || !Handsontable.Dom.hasClass(parent, 'wtHolder')) {
      var holder = document.createElement('DIV');
      holder.style.position = 'relative';
      holder.className = 'wtHolder';

      if (parent) {
        parent.insertBefore(holder, this.hider); //if TABLE is detached (e.g. in Jasmine test), it has no parentNode so we cannot attach holder to it
      }

      if(!instance.cloneSource) {
        holder.parentNode.className += 'ht_master handsontable';
      }

      holder.appendChild(this.hider);
    }
    this.holder = this.hider.parentNode;

    this.wtRootElement = this.holder.parentNode;

    this.alignOverlaysWithTrimmingContainer();

    //bootstrap from settings
    this.TBODY = this.TABLE.getElementsByTagName('TBODY')[0];
    if (!this.TBODY) {
      this.TBODY = document.createElement('TBODY');
      this.TABLE.appendChild(this.TBODY);
    }
    this.THEAD = this.TABLE.getElementsByTagName('THEAD')[0];
    if (!this.THEAD) {
      this.THEAD = document.createElement('THEAD');
      this.TABLE.insertBefore(this.THEAD, this.TBODY);
    }
    this.COLGROUP = this.TABLE.getElementsByTagName('COLGROUP')[0];
    if (!this.COLGROUP) {
      this.COLGROUP = document.createElement('COLGROUP');
      this.TABLE.insertBefore(this.COLGROUP, this.THEAD);
    }

    if (this.instance.getSetting('columnHeaders').length) {
      if (!this.THEAD.childNodes.length) {
        var TR = document.createElement('TR');
        this.THEAD.appendChild(TR);
      }
    }

    this.colgroupChildrenLength = this.COLGROUP.childNodes.length;
    this.theadChildrenLength = this.THEAD.firstChild ? this.THEAD.firstChild.childNodes.length : 0;
    this.tbodyChildrenLength = this.TBODY.childNodes.length;

    this.rowFilter = null;
    this.columnFilter = null;
  }

  WalkontableTable.prototype.alignOverlaysWithTrimmingContainer = function () {
    var trimmingElement = Handsontable.Dom.getTrimmingContainer(this.wtRootElement);

    if (!this.isWorkingOnClone()) {
      this.holder.parentNode.style.position = "relative";

      if(trimmingElement !== window) {
        this.holder.style.width = Handsontable.Dom.getStyle(trimmingElement, 'width');
        this.holder.style.height = Handsontable.Dom.getStyle(trimmingElement, 'height');
      } else {
        this.holder.style.overflow = "visible";
        this.wtRootElement.style.overflow = "visible";
      }
    }
  };

  WalkontableTable.prototype.isWorkingOnClone = function () {
    return !!this.instance.cloneSource;
  };

  /**
   * Redraws the table
   *
   * @param fastDraw {Boolean} If TRUE, will try to avoid full redraw and only update the border positions. If FALSE or UNDEFINED, will perform a full redraw
   * @returns {WalkontableTable}
   */
  WalkontableTable.prototype.draw = function (fastDraw) {
    if (!this.isWorkingOnClone()) {
      this.holderOffset = Handsontable.Dom.offset(this.holder);
      fastDraw = this.instance.wtViewport.createRenderCalculators(fastDraw);
    }

    if (!fastDraw) {
      if (this.isWorkingOnClone()) {
        this.tableOffset = this.instance.cloneSource.wtTable.tableOffset;
      }
      else {
        this.tableOffset = Handsontable.Dom.offset(this.TABLE);
      }
      var startRow;
      if (this.instance.cloneOverlay instanceof WalkontableDebugOverlay ||
          this.instance.cloneOverlay instanceof WalkontableTopOverlay ||
          this.instance.cloneOverlay instanceof WalkontableCornerOverlay) {
        startRow = 0;
      }
      else {
        startRow = this.instance.wtViewport.rowsRenderCalculator.startRow;
      }


      var startColumn;
      if (this.instance.cloneOverlay instanceof WalkontableDebugOverlay ||
          this.instance.cloneOverlay instanceof  WalkontableLeftOverlay ||
          this.instance.cloneOverlay instanceof WalkontableCornerOverlay) {
        startColumn = 0;
      } else {
        startColumn = this.instance.wtViewport.columnsRenderCalculator.startColumn;
      }

      this.rowFilter = new WalkontableRowFilter(
          startRow,
          this.instance.getSetting('totalRows'),
          this.instance.getSetting('columnHeaders').length
      );
      this.columnFilter = new WalkontableColumnFilter(
          startColumn,
          this.instance.getSetting('totalColumns'),
          this.instance.getSetting('rowHeaders').length
      );
      this._doDraw(); //creates calculator after draw

      this.alignOverlaysWithTrimmingContainer();

    }
    else {
      if (!this.isWorkingOnClone()) {
        //in case we only scrolled without redraw, update visible rows information in oldRowsCalculator
        this.instance.wtViewport.createVisibleCalculators();
      }
      if (this.instance.wtOverlays) {
        this.instance.wtOverlays.refresh(true);
      }
    }

    this.refreshSelections(fastDraw);

    if (!this.isWorkingOnClone()) {
      this.instance.wtOverlays.topOverlay.resetFixedPosition();
      this.instance.wtOverlays.leftOverlay.resetFixedPosition();
      this.instance.wtOverlays.topLeftCornerOverlay.resetFixedPosition();
    }

    this.instance.drawn = true;
    return this;
  };

  WalkontableTable.prototype._doDraw = function () {
    var wtRenderer = new WalkontableTableRenderer(this);
    wtRenderer.render();
  };

  WalkontableTable.prototype.removeClassFromCells = function (className) {
    var nodes = this.TABLE.querySelectorAll('.' + className);
    for (var i = 0, ilen = nodes.length; i < ilen; i++) {
      Handsontable.Dom.removeClass(nodes[i], className);
    }
  };

  WalkontableTable.prototype.refreshSelections = function (fastDraw) {
    var i, len;

    if (!this.instance.selections) {
      return;
    }
    len = this.instance.selections.length;

    if (fastDraw) {
      for (i = 0; i < len; i++) {
        // there was no rerender, so we need to remove classNames by ourselves
        if (this.instance.selections[i].settings.className) {
          this.removeClassFromCells(this.instance.selections[i].settings.className);
        }
        if (this.instance.selections[i].settings.highlightRowClassName) {
          this.removeClassFromCells(this.instance.selections[i].settings.highlightRowClassName);
        }
        if (this.instance.selections[i].settings.highlightColumnClassName) {
          this.removeClassFromCells(this.instance.selections[i].settings.highlightColumnClassName);
        }
      }
    }
    for (i = 0; i < len; i++) {
      this.instance.selections[i].draw(this.instance, fastDraw);
    }
  };

  /**
   * getCell
   *
   * @param {WalkontableCellCoords} coords
   * @returns {Object} HTMLElement on success or {Number} one of the exit codes on error:
   *  -1 row before viewport
   *  -2 row after viewport
   */
  WalkontableTable.prototype.getCell = function (coords) {
    if (this.isRowBeforeRenderedRows(coords.row)) {
      return -1; //row before rendered rows
    }
    else if (this.isRowAfterRenderedRows(coords.row)) {
      return -2; //row after rendered rows
    }

    var TR = this.TBODY.childNodes[this.rowFilter.sourceToRendered(coords.row)];

    if (TR) {
      return TR.childNodes[this.columnFilter.sourceColumnToVisibleRowHeadedColumn(coords.col)];
    }
  };

  /**
   * getColumnHeader
   *
   * @param col
   * @param level Header level (0 = most distant to the table)
   * @returns {Object} HTMLElement on success or undefined on error
   */
  WalkontableTable.prototype.getColumnHeader = function(col, level) {
    if(!level) {
      level = 0;
    }

    var TR = this.THEAD.childNodes[level];
    if (TR) {
      return TR.childNodes[this.columnFilter.sourceColumnToVisibleRowHeadedColumn(col)];
    }
  };

  /**
   * getRowHeader
   *
   * @param row
   * @returns {Object} HTMLElement on success or {Number} one of the exit codes on error:
   *  null table doesn't have row headers
   */
  WalkontableTable.prototype.getRowHeader = function(row) {
    if(this.columnFilter.sourceColumnToVisibleRowHeadedColumn(0) === 0) {
      return null;
    }

    var TR = this.TBODY.childNodes[this.rowFilter.sourceToRendered(row)];

    if (TR) {
      return TR.childNodes[0];
    }
  };

  /**
   * Returns cell coords object for a given TD
   *
   * @param TD
   * @returns {WalkontableCellCoords}
   */
  WalkontableTable.prototype.getCoords = function (TD) {
    var TR = TD.parentNode;
    var row = Handsontable.Dom.index(TR);
    if (TR.parentNode === this.THEAD) {
      row = this.rowFilter.visibleColHeadedRowToSourceRow(row);
    }
    else {
      row = this.rowFilter.renderedToSource(row);
    }

    return new WalkontableCellCoords(
        row,
        this.columnFilter.visibleRowHeadedColumnToSourceColumn(TD.cellIndex)
    );
  };

  WalkontableTable.prototype.getTrForRow = function (row) {
    return this.TBODY.childNodes[this.rowFilter.sourceToRendered(row)];
  };

  WalkontableTable.prototype.getFirstRenderedRow = function () {
    return this.instance.wtViewport.rowsRenderCalculator.startRow;
  };

  WalkontableTable.prototype.getFirstVisibleRow = function () {
    return this.instance.wtViewport.rowsVisibleCalculator.startRow;
  };

  WalkontableTable.prototype.getFirstRenderedColumn = function () {
    return this.instance.wtViewport.columnsRenderCalculator.startColumn;
  };

//returns -1 if no column is visible
  WalkontableTable.prototype.getFirstVisibleColumn = function () {
    return this.instance.wtViewport.columnsVisibleCalculator.startColumn;
  };

//returns -1 if no row is visible
  WalkontableTable.prototype.getLastRenderedRow = function () {
    return this.instance.wtViewport.rowsRenderCalculator.endRow;
  };

  WalkontableTable.prototype.getLastVisibleRow = function () {
    return this.instance.wtViewport.rowsVisibleCalculator.endRow;
  };

  WalkontableTable.prototype.getLastRenderedColumn = function () {
    return this.instance.wtViewport.columnsRenderCalculator.endColumn;
  };

//returns -1 if no column is visible
  WalkontableTable.prototype.getLastVisibleColumn = function () {
    return this.instance.wtViewport.columnsVisibleCalculator.endColumn;
  };

  WalkontableTable.prototype.isRowBeforeRenderedRows = function (r) {
    return (this.rowFilter.sourceToRendered(r) < 0 && r >= 0);
  };

  WalkontableTable.prototype.isRowAfterViewport = function (r) {
    return (r > this.getLastVisibleRow());
  };

  WalkontableTable.prototype.isRowAfterRenderedRows = function (r) {
    return (r > this.getLastRenderedRow());
  };

  WalkontableTable.prototype.isColumnBeforeViewport = function (c) {
    return (this.columnFilter.sourceToRendered(c) < 0 && c >= 0);
  };

  WalkontableTable.prototype.isColumnAfterViewport = function (c) {
    return (c > this.getLastVisibleColumn());
  };

  WalkontableTable.prototype.isLastRowFullyVisible = function () {
    return (this.getLastVisibleRow() === this.getLastRenderedRow());
  };

  WalkontableTable.prototype.isLastColumnFullyVisible = function () {
    return (this.getLastVisibleColumn() === this.getLastRenderedColumn);
  };

  WalkontableTable.prototype.getRenderedColumnsCount = function () {
    if (this.instance.cloneOverlay instanceof WalkontableDebugOverlay) {
      return this.instance.getSetting('totalColumns');
    }
    else if (this.instance.cloneOverlay instanceof WalkontableLeftOverlay || this.instance.cloneOverlay instanceof WalkontableCornerOverlay) {
      return this.instance.getSetting('fixedColumnsLeft');
    }
    else {
      return this.instance.wtViewport.columnsRenderCalculator.count;
    }
  };

  WalkontableTable.prototype.getRenderedRowsCount = function () {
    if (this.instance.cloneOverlay instanceof WalkontableDebugOverlay) {
      return this.instance.getSetting('totalRows');
    }
    else if (this.instance.cloneOverlay instanceof WalkontableTopOverlay || this.instance.cloneOverlay instanceof WalkontableCornerOverlay) {
      return this.instance.getSetting('fixedRowsTop');
    }
    return this.instance.wtViewport.rowsRenderCalculator.count;
  };

  WalkontableTable.prototype.getVisibleRowsCount = function () {
    return this.instance.wtViewport.rowsVisibleCalculator.count;
  };

  WalkontableTable.prototype.allRowsInViewport = function () {
    return this.instance.getSetting('totalRows') == this.getVisibleRowsCount();
  };

  /**
   * Checks if any of the row's cells content exceeds its initial height, and if so, returns the oversized height
   *
   * @param {Number} sourceRow
   * @returns {Number}
   */
  WalkontableTable.prototype.getRowHeight = function (sourceRow) {
    var height = this.instance.wtSettings.settings.rowHeight(sourceRow);
    var oversizedHeight = this.instance.wtViewport.oversizedRows[sourceRow];
    if (oversizedHeight !== void 0) {
      height = height ? Math.max(height, oversizedHeight) : oversizedHeight;
    }
    return height;
  };

  WalkontableTable.prototype.getColumnHeaderHeight = function (level) {
    var height = this.instance.wtSettings.settings.defaultRowHeight,
        oversizedHeight = this.instance.wtViewport.oversizedColumnHeaders[level];
    if (oversizedHeight !== void 0) {
      height = height ? Math.max(height, oversizedHeight) : oversizedHeight;
    }
    return height;
  };

  WalkontableTable.prototype.getVisibleColumnsCount = function () {
    return this.instance.wtViewport.columnsVisibleCalculator.count;
  };


  WalkontableTable.prototype.allColumnsInViewport = function () {
    return this.instance.getSetting('totalColumns') == this.getVisibleColumnsCount();
  };



  WalkontableTable.prototype.getColumnWidth = function (sourceColumn) {
    var width = this.instance.wtSettings.settings.columnWidth;
    if(typeof width === 'function') {
      width = width(sourceColumn);
    } else if(typeof width === 'object') {
      width = width[sourceColumn];
    }

    var oversizedWidth = this.instance.wtViewport.oversizedCols[sourceColumn];
    if (oversizedWidth !== void 0) {
      width = width ? Math.max(width, oversizedWidth) : oversizedWidth;
    }
    return width;
  };

  WalkontableTable.prototype.getStretchedColumnWidth = function (sourceColumn) {
    var
        width = this.getColumnWidth(sourceColumn) || this.instance.wtSettings.settings.defaultColumnWidth,
        calculator = this.instance.wtViewport.columnsRenderCalculator,
        stretchedWidth;

    if (calculator) {
      stretchedWidth = calculator.getStretchedColumnWidth(sourceColumn, width);

      if (stretchedWidth) {
        width = stretchedWidth;
      }
    }

    return width;
  };


  function WalkontableTableRenderer(wtTable) {
    this.wtTable = wtTable;
    this.instance = wtTable.instance;
    this.rowFilter = wtTable.rowFilter;
    this.columnFilter = wtTable.columnFilter;

    this.TABLE = wtTable.TABLE;
    this.THEAD = wtTable.THEAD;
    this.TBODY = wtTable.TBODY;
    this.COLGROUP = wtTable.COLGROUP;

    this.utils = WalkontableTableRenderer.utils;

  }

  WalkontableTableRenderer.prototype.render = function () {
    if (!this.wtTable.isWorkingOnClone()) {
      this.instance.getSetting('beforeDraw', true);
    }

    this.rowHeaders = this.instance.getSetting('rowHeaders');
    this.rowHeaderCount = this.rowHeaders.length;
    this.fixedRowsTop = this.instance.getSetting('fixedRowsTop');
    this.columnHeaders = this.instance.getSetting('columnHeaders');
    this.columnHeaderCount = this.columnHeaders.length;

    var visibleColIndex
        , totalRows = this.instance.getSetting('totalRows')
        , totalColumns = this.instance.getSetting('totalColumns')
        , columnsToRender = this.wtTable.getRenderedColumnsCount()
        , adjusted = false
        , workspaceWidth
        , rowsToRender = this.wtTable.getRenderedRowsCount();

    if (totalColumns > 0) {

      // prepare COL and TH elements for rendering
      this.adjustAvailableNodes();
      adjusted = true;

      // assign row header classnames
      this.renderColGroups();

      this.renderColumnHeaders();

      //Render table rows
      this.renderRows(totalRows, rowsToRender, columnsToRender);

      if (!this.wtTable.isWorkingOnClone()) {
        workspaceWidth = this.instance.wtViewport.getWorkspaceWidth();
        this.instance.wtViewport.containerWidth = null;
      } else {
        this.adjustColumnHeaderHeights();
      }

      this.adjustColumnWidths(columnsToRender);
    }

    if (!adjusted) {
      this.adjustAvailableNodes();
    }

    this.removeRedundantRows(rowsToRender);

    if (!this.wtTable.isWorkingOnClone()) {
      this.markOversizedRows();

      this.instance.wtViewport.createVisibleCalculators();

      this.instance.wtOverlays.applyToDOM();

      this.instance.wtOverlays.refresh(false);

      if (workspaceWidth !== this.instance.wtViewport.getWorkspaceWidth()) {
        //workspace width changed though to shown/hidden vertical scrollbar. Let's reapply stretching
        this.instance.wtViewport.containerWidth = null;

        var firstRendered = this.wtTable.getFirstRenderedColumn();
        var lastRendered = this.wtTable.getLastRenderedColumn();

        for (var i = firstRendered ; i < lastRendered; i++) {
          var width = this.wtTable.getStretchedColumnWidth(i);
          var renderedIndex = this.columnFilter.sourceToRendered(i);
          this.COLGROUP.childNodes[renderedIndex + this.rowHeaderCount].style.width = width + 'px';
        }
      }

      this.instance.getSetting('onDraw', true);
    }
  };

  WalkontableTableRenderer.prototype.removeRedundantRows = function (renderedRowsCount) {
    while (this.wtTable.tbodyChildrenLength > renderedRowsCount) {
      this.TBODY.removeChild(this.TBODY.lastChild);
      this.wtTable.tbodyChildrenLength--;
    }
  };

  WalkontableTableRenderer.prototype.renderRows = function (totalRows, rowsToRender, columnsToRender) {
    var lastTD, TR;
    var visibleRowIndex = 0;
    var sourceRowIndex = this.rowFilter.renderedToSource(visibleRowIndex);
    var isWorkingOnClone = this.wtTable.isWorkingOnClone();

    while (sourceRowIndex < totalRows && sourceRowIndex >= 0) {
      if (visibleRowIndex > 1000) {
        throw new Error('Security brake: Too much TRs. Please define height for your table, which will enforce scrollbars.');
      }

      if (rowsToRender !== void 0 && visibleRowIndex === rowsToRender) {
        break; //we have as much rows as needed for this clone
      }

      TR = this.getOrCreateTrForRow(visibleRowIndex, TR);

      //Render row headers
      this.renderRowHeaders(sourceRowIndex, TR);

      // Add and/or remove TDs to TR to match the desired number
      this.adjustColumns(TR, columnsToRender + this.rowHeaderCount);

      lastTD = this.renderCells(sourceRowIndex, TR, columnsToRender);

      if (!isWorkingOnClone) {
        // reset the oversized row cache for this row
        this.resetOversizedRow(sourceRowIndex);
      }

      if (TR.firstChild) {
        //if I have 2 fixed columns with one-line content and the 3rd column has a multiline content, this is the way to make sure that the overlay will has same row height
        var height = this.instance.wtTable.getRowHeight(sourceRowIndex);
        if (height) {
          TR.firstChild.style.height = height + 'px';
        }
        else {
          TR.firstChild.style.height = '';
        }
      }

      visibleRowIndex++;

      sourceRowIndex = this.rowFilter.renderedToSource(visibleRowIndex);
    }
  };

  /**
   * Reset the oversized row cache for the provided index
   * @param sourceRow {Number} Row index
   */
  WalkontableTableRenderer.prototype.resetOversizedRow = function (sourceRow) {
    if (this.instance.wtViewport.oversizedRows && this.instance.wtViewport.oversizedRows[sourceRow]) {
      this.instance.wtViewport.oversizedRows[sourceRow] = void 0;  //void 0 is faster than delete, see http://jsperf.com/delete-vs-undefined-vs-null/16
    }
  };

  /**
   * Check if any of the rendered rows is higher than expected, and if so, cache them
   */
  WalkontableTableRenderer.prototype.markOversizedRows = function () {
    var previousRowHeight
        , trInnerHeight
        , sourceRowIndex
        , currentTr;

    var rowCount = this.instance.wtTable.TBODY.childNodes.length;
    while (rowCount) {
      rowCount--;
      sourceRowIndex = this.instance.wtTable.rowFilter.renderedToSource(rowCount);
      previousRowHeight = this.instance.wtTable.getRowHeight(sourceRowIndex);
      currentTr = this.instance.wtTable.getTrForRow(sourceRowIndex);

      trInnerHeight = Handsontable.Dom.innerHeight(currentTr) - 1;

      if ((!previousRowHeight && this.instance.wtSettings.settings.defaultRowHeight < trInnerHeight || previousRowHeight < trInnerHeight)) {
        this.instance.wtViewport.oversizedRows[sourceRowIndex] = trInnerHeight;
      }
    }

  };

  WalkontableTableRenderer.prototype.adjustColumnHeaderHeights = function () {
    var columnHeaders = this.instance.getSetting('columnHeaders');
    for(var i = 0, columnHeadersCount = columnHeaders.length; i < columnHeadersCount; i++) {
      if(this.instance.wtViewport.oversizedColumnHeaders[i]) {
        if(this.instance.wtTable.THEAD.childNodes[i].childNodes.length === 0) {
          return;
        }
        this.instance.wtTable.THEAD.childNodes[i].childNodes[0].style.height = this.instance.wtViewport.oversizedColumnHeaders[i] + "px";
      }
    }
  };

  /**
   * Check if column header for the specified column is higher than expected, and if so, cache it
   * @param col {Number} Index of column
   */
  WalkontableTableRenderer.prototype.markIfOversizedColumnHeader = function (col) {
    var colCount = this.instance.wtTable.THEAD.childNodes.length !== 0 ? this.instance.wtTable.THEAD.childNodes[0].childNodes.length : 0,
        sourceColIndex,
        previousColHeaderHeight,
        currentHeader,
        currentHeaderHeight,
        columnHeaders = this.instance.getSetting('columnHeaders'),
        columnHeaderCount = columnHeaders.length,
        level = columnHeaderCount;

    sourceColIndex = this.instance.wtTable.columnFilter.renderedToSource(col);

    while(level) {
      level--;

      previousColHeaderHeight = this.instance.wtTable.getColumnHeaderHeight(level);
      currentHeader = this.instance.wtTable.getColumnHeader(sourceColIndex, level);

      if(!currentHeader) {
        continue;
      }

      currentHeaderHeight = Handsontable.Dom.innerHeight(currentHeader) - 1;

      if ((!previousColHeaderHeight && this.instance.wtSettings.settings.defaultRowHeight < currentHeaderHeight || previousColHeaderHeight < currentHeaderHeight)) {
        this.instance.wtViewport.oversizedColumnHeaders[level] = currentHeaderHeight;
      }
    }
  };

  WalkontableTableRenderer.prototype.renderCells = function (sourceRowIndex, TR, columnsToRender) {
    var TD, sourceColIndex;

    for (var visibleColIndex = 0; visibleColIndex < columnsToRender; visibleColIndex++) {
      sourceColIndex = this.columnFilter.renderedToSource(visibleColIndex);
      if (visibleColIndex === 0) {
        TD = TR.childNodes[this.columnFilter.sourceColumnToVisibleRowHeadedColumn(sourceColIndex)];
      }
      else {
        TD = TD.nextSibling; //http://jsperf.com/nextsibling-vs-indexed-childnodes
      }

      //If the number of headers has been reduced, we need to replace excess TH with TD
      if (TD.nodeName == 'TH') {
        TD = this.utils.replaceThWithTd(TD, TR);
      }

      if (!Handsontable.Dom.hasClass(TD, 'hide')) {
        TD.className = '';
      }

      TD.removeAttribute('style');

      this.instance.wtSettings.settings.cellRenderer(sourceRowIndex, sourceColIndex, TD);

    }

    return TD;
  };

  WalkontableTableRenderer.prototype.adjustColumnWidths = function (columnsToRender) {
    var width,
        rowsCalculator = this.instance.wtViewport.rowsRenderCalculator,
        scrollbarCompensation = 0,
        sourceInstance = this.instance.cloneSource ? this.instance.cloneSource : this.instance,
        mainHolder = sourceInstance.wtTable.holder,
        trimmingContainer = Handsontable.Dom.getTrimmingContainer(sourceInstance.wtTable.TABLE);

    if(mainHolder.offsetHeight < mainHolder.scrollHeight) {
      scrollbarCompensation = Handsontable.Dom.getScrollbarWidth();
    }

    this.instance.wtViewport.columnsRenderCalculator.refreshStretching(this.instance.wtViewport.getViewportWidth() - scrollbarCompensation);
    //this.instance.wtViewport.columnsRenderCalculator.refreshStretching(this.instance.wtViewport.getViewportWidth());

    for (var renderedColIndex = 0; renderedColIndex < columnsToRender; renderedColIndex++) {
      width = this.wtTable.getStretchedColumnWidth(this.columnFilter.renderedToSource(renderedColIndex));
      this.COLGROUP.childNodes[renderedColIndex + this.rowHeaderCount].style.width = width + 'px';
    }
  };

  WalkontableTableRenderer.prototype.appendToTbody = function (TR) {
    this.TBODY.appendChild(TR);
    this.wtTable.tbodyChildrenLength++;
  };

  WalkontableTableRenderer.prototype.getOrCreateTrForRow = function (rowIndex, currentTr) {
    var TR;

    if (rowIndex >= this.wtTable.tbodyChildrenLength) {
      TR = this.createRow();
      this.appendToTbody(TR);
    } else if (rowIndex === 0) {
      TR = this.TBODY.firstChild;
    } else {
      TR = currentTr.nextSibling; //http://jsperf.com/nextsibling-vs-indexed-childnodes
    }

    return TR;
  };

  WalkontableTableRenderer.prototype.createRow = function () {
    var TR = document.createElement('TR');
    for (var visibleColIndex = 0; visibleColIndex < this.rowHeaderCount; visibleColIndex++) {
      TR.appendChild(document.createElement('TH'));
    }

    return TR;
  };

  WalkontableTableRenderer.prototype.renderRowHeader = function(row, col, TH){
    TH.className = '';
    TH.removeAttribute('style');
    this.rowHeaders[col](row, TH, col);
  };

  WalkontableTableRenderer.prototype.renderRowHeaders = function (row, TR) {
    for (var TH = TR.firstChild, visibleColIndex = 0; visibleColIndex < this.rowHeaderCount; visibleColIndex++) {

      //If the number of row headers increased we need to create TH or replace an existing TD node with TH
      if (!TH) {
        TH = document.createElement('TH');
        TR.appendChild(TH);
      } else if (TH.nodeName == 'TD') {
        TH = this.utils.replaceTdWithTh(TH, TR);
      }

      this.renderRowHeader(row, visibleColIndex, TH);
      TH = TH.nextSibling; //http://jsperf.com/nextsibling-vs-indexed-childnodes
    }
  };

  /**
   * Adjust the number of COL and TH elements to match the number of columns and headers that need to be rendered
   */
  WalkontableTableRenderer.prototype.adjustAvailableNodes = function () {
    //adjust COLGROUP
    this.adjustColGroups();

    //adjust THEAD
    this.adjustThead();
  };

  /**
   * Renders the column headers
   */
  WalkontableTableRenderer.prototype.renderColumnHeaders = function () {
    if (!this.columnHeaderCount) {
      return;
    }

    var columnCount = this.wtTable.getRenderedColumnsCount(),
        TR,
        renderedColumnIndex;

    for (var i = 0; i < this.columnHeaderCount; i++) {
      TR = this.getTrForColumnHeaders(i);

      for (renderedColumnIndex = (-1) * this.rowHeaderCount; renderedColumnIndex < columnCount; renderedColumnIndex++) {
        var sourceCol = this.columnFilter.renderedToSource(renderedColumnIndex);
        this.renderColumnHeader(i, sourceCol, TR.childNodes[renderedColumnIndex + this.rowHeaderCount]);

        if(!this.wtTable.isWorkingOnClone()) {
          this.markIfOversizedColumnHeader(renderedColumnIndex);
        }
      }
    }
  };

  /**
   * Adjusts the number of COL elements to match the number of columns that need to be rendered
   */
  WalkontableTableRenderer.prototype.adjustColGroups = function () {
    var columnCount = this.wtTable.getRenderedColumnsCount();

    //adjust COLGROUP
    while (this.wtTable.colgroupChildrenLength < columnCount + this.rowHeaderCount) {
      this.COLGROUP.appendChild(document.createElement('COL'));
      this.wtTable.colgroupChildrenLength++;
    }
    while (this.wtTable.colgroupChildrenLength > columnCount + this.rowHeaderCount) {
      this.COLGROUP.removeChild(this.COLGROUP.lastChild);
      this.wtTable.colgroupChildrenLength--;
    }
  };

  /**
   * Adjusts the number of TH elements in THEAD to match the number of headers and columns that need to be rendered
   */
  WalkontableTableRenderer.prototype.adjustThead = function () {
    var columnCount = this.wtTable.getRenderedColumnsCount();
    var TR = this.THEAD.firstChild;
    if (this.columnHeaders.length) {

      for (var i = 0, columnHeadersLength = this.columnHeaders.length; i < columnHeadersLength; i++) {
        TR = this.THEAD.childNodes[i];
        if (!TR) {
          TR = document.createElement('TR');
          this.THEAD.appendChild(TR);
        }
        this.theadChildrenLength = TR.childNodes.length;
        while (this.theadChildrenLength < columnCount + this.rowHeaderCount) {
          TR.appendChild(document.createElement('TH'));
          this.theadChildrenLength++;
        }
        while (this.theadChildrenLength > columnCount + this.rowHeaderCount) {
          TR.removeChild(TR.lastChild);
          this.theadChildrenLength--;
        }
      }

      var theadChildrenLength = this.THEAD.childNodes.length;
      if(theadChildrenLength > this.columnHeaders.length) {
        for(var i = this.columnHeaders.length; i < theadChildrenLength; i++ ) {
          this.THEAD.removeChild(this.THEAD.lastChild);
        }
      }
    } else if (TR) {
      Handsontable.Dom.empty(TR);
    }
  };

  WalkontableTableRenderer.prototype.getTrForColumnHeaders = function (index) {
    var TR = this.THEAD.childNodes[index];
    return TR;
  };

  WalkontableTableRenderer.prototype.renderColumnHeader = function (row, col, TH) {
    TH.className = '';
    TH.removeAttribute('style');
    return this.columnHeaders[row](col, TH, row);
  };

  /**
   * Assign the row header classnames to the columns being row headers
   */
  WalkontableTableRenderer.prototype.renderColGroups = function () {
    for (var colIndex = 0; colIndex < this.wtTable.colgroupChildrenLength; colIndex++) {
      if (colIndex < this.rowHeaderCount) {
        Handsontable.Dom.addClass(this.COLGROUP.childNodes[colIndex], 'rowHeader');
      }
      else {
        Handsontable.Dom.removeClass(this.COLGROUP.childNodes[colIndex], 'rowHeader');
      }
    }
  };

  /**
   * Add and/or remove the TDs to match the desired number
   * @param TR {HTMLElement} Table row in question
   * @param desiredCount {Number} The desired number of TDs in the TR
   */
  WalkontableTableRenderer.prototype.adjustColumns = function (TR, desiredCount) {
    var count = TR.childNodes.length;
    while (count < desiredCount) {
      var TD = document.createElement('TD');
      TR.appendChild(TD);
      count++;
    }
    while (count > desiredCount) {
      TR.removeChild(TR.lastChild);
      count--;
    }
  };

  WalkontableTableRenderer.prototype.removeRedundantColumns = function (columnsToRender) {
    while (this.wtTable.tbodyChildrenLength > columnsToRender) {
      this.TBODY.removeChild(this.TBODY.lastChild);
      this.wtTable.tbodyChildrenLength--;
    }
  };

  /*
   Helper functions, which does not have any side effects
   */
  WalkontableTableRenderer.utils = {};

  WalkontableTableRenderer.utils.replaceTdWithTh = function (TD, TR) {
    var TH;
    TH = document.createElement('TH');
    TR.insertBefore(TH, TD);
    TR.removeChild(TD);

    return TH;
  };

  WalkontableTableRenderer.utils.replaceThWithTd = function (TH, TR) {
    var TD = document.createElement('TD');
    TR.insertBefore(TD, TH);
    TR.removeChild(TH);

    return TD;
  };



  function WalkontableViewport(instance) {
    this.instance = instance;
    this.oversizedRows = [];
    this.oversizedCols = [];
    this.oversizedColumnHeaders = [];

    var that = this;

    var eventManager = Handsontable.eventManager(instance);
    eventManager.addEventListener(window,'resize',function () {
      that.clientHeight = that.getWorkspaceHeight();
    });
  }

  WalkontableViewport.prototype.getWorkspaceHeight = function () {
    //var scrollHandler = this.instance.wtOverlays.topOverlay.scrollHandler;
    var trimmingContainer = this.instance.wtOverlays.topOverlay.trimmingContainer;

    if (trimmingContainer === window) {
      return document.documentElement.clientHeight;
    }
    else {
      var elemHeight = Handsontable.Dom.outerHeight(trimmingContainer);
      var height = (elemHeight > 0 && trimmingContainer.clientHeight > 0) ? trimmingContainer.clientHeight : Infinity; //returns height without DIV scrollbar
      return height;
    }
  };


  WalkontableViewport.prototype.getWorkspaceWidth = function () {
    var width,
        totalColumns = this.instance.getSetting("totalColumns"),
        trimmingContainer = this.instance.wtOverlays.leftOverlay.trimmingContainer,
        overflow,
        stretchSetting = this.instance.getSetting('stretchH');

    if(Handsontable.freezeOverlays) {
      width = Math.min(document.documentElement.offsetWidth - this.getWorkspaceOffset().left, document.documentElement.offsetWidth);
    } else {
      width = Math.min(this.getContainerFillWidth(), document.documentElement.offsetWidth - this.getWorkspaceOffset().left, document.documentElement.offsetWidth);
    }

    if (trimmingContainer === window && totalColumns > 0 && this.sumColumnWidths(0, totalColumns - 1) > width) {
      //in case sum of column widths is higher than available stylesheet width, let's assume using the whole window
      //otherwise continue below, which will allow stretching
      //this is used in `scroll_window.html`
      //TODO test me
      return document.documentElement.clientWidth;
    }

    if (trimmingContainer !== window){
      overflow = this.instance.wtOverlays.leftOverlay.trimmingContainer.style.overflow;

      if (overflow == "scroll" || overflow == "hidden" || overflow == "auto") {
        //this is used in `scroll.html`
        //TODO test me
        return Math.max(width, trimmingContainer.clientWidth);
      }
    }

    if(stretchSetting === 'none' || !stretchSetting) {
      // if no stretching is used, return the maximum used workspace width
      return Math.max(width, Handsontable.Dom.outerWidth(this.instance.wtTable.TABLE));
    } else {
      // if stretching is used, return the actual container width, so the columns can fit inside it
      return width;
    }
  };

  WalkontableViewport.prototype.sumColumnWidths = function (from, length) {
    var sum = 0;
    while(from < length) {
      sum += this.instance.wtTable.getColumnWidth(from) || this.instance.wtSettings.defaultColumnWidth;
      from++;
    }
    return sum;
  };
  WalkontableViewport.prototype.getContainerFillWidth = function() {

    if(this.containerWidth) {
      return this.containerWidth;
    }

    var mainContainer = this.instance.wtTable.holder,
        fillWidth,
        dummyElement;

    //while(mainContainer.parentNode != document.body && mainContainer.parentNode != null && mainContainer.className.indexOf('handsontable') === -1) {
    //  mainContainer = mainContainer.parentNode;
    //}

    dummyElement = document.createElement("DIV");
    dummyElement.style.width = "100%";
    dummyElement.style.height = "1px";
    mainContainer.appendChild(dummyElement);
    fillWidth = dummyElement.offsetWidth;

    this.containerWidth = fillWidth;

    mainContainer.removeChild(dummyElement);

    return fillWidth;
  };

  WalkontableViewport.prototype.getWorkspaceOffset = function () {
    return Handsontable.Dom.offset(this.instance.wtTable.TABLE);
  };

  WalkontableViewport.prototype.getWorkspaceActualHeight = function () {
    return Handsontable.Dom.outerHeight(this.instance.wtTable.TABLE);
  };

  WalkontableViewport.prototype.getWorkspaceActualWidth = function () {
    return Handsontable.Dom.outerWidth(this.instance.wtTable.TABLE) ||
        Handsontable.Dom.outerWidth(this.instance.wtTable.TBODY) ||
        Handsontable.Dom.outerWidth(this.instance.wtTable.THEAD); //IE8 reports 0 as <table> offsetWidth;
  };

  WalkontableViewport.prototype.getColumnHeaderHeight = function () {
    if (isNaN(this.columnHeaderHeight)) {
      this.columnHeaderHeight = Handsontable.Dom.outerHeight(this.instance.wtTable.THEAD);
    }
    return this.columnHeaderHeight;
  };

  WalkontableViewport.prototype.getViewportHeight = function () {

    var containerHeight = this.getWorkspaceHeight();

    if (containerHeight === Infinity) {
      return containerHeight;
    }

    var columnHeaderHeight = this.getColumnHeaderHeight();
    if (columnHeaderHeight > 0) {
      containerHeight -= columnHeaderHeight;
    }

    return containerHeight;

  };

  WalkontableViewport.prototype.getRowHeaderWidth = function () {
    if (this.instance.cloneSource) {
      return this.instance.cloneSource.wtViewport.getRowHeaderWidth();
    }
    if (isNaN(this.rowHeaderWidth)) {
      var rowHeaders = this.instance.getSetting('rowHeaders');
      if (rowHeaders.length) {
        var TH = this.instance.wtTable.TABLE.querySelector('TH');
        this.rowHeaderWidth = 0;
        for (var i = 0, ilen = rowHeaders.length; i < ilen; i++) {
          if (TH) {
            this.rowHeaderWidth += Handsontable.Dom.outerWidth(TH);
            TH = TH.nextSibling;
          }
          else {
            this.rowHeaderWidth += 50; //yes this is a cheat but it worked like that before, just taking assumption from CSS instead of measuring. TODO: proper fix
          }
        }
      }
      else {
        this.rowHeaderWidth = 0;
      }
    }
    return this.rowHeaderWidth;
  };

// Viewport width = Workspace width - Row Headers width
  WalkontableViewport.prototype.getViewportWidth = function () {
    var containerWidth = this.getWorkspaceWidth(),
        rowHeaderWidth;

    if (containerWidth === Infinity) {
      return containerWidth;
    }
    rowHeaderWidth = this.getRowHeaderWidth();

    if (rowHeaderWidth > 0) {
      return containerWidth - rowHeaderWidth;
    }

    return containerWidth;
  };

  /**
   * Creates:
   *  - rowsRenderCalculator (before draw, to qualify rows for rendering)
   *  - rowsVisibleCalculator (after draw, to measure which rows are actually visible)
   *
   * @returns {WalkontableViewportRowsCalculator}
   */
  WalkontableViewport.prototype.createRowsCalculator = function (visible) {
    this.rowHeaderWidth = NaN;
    var height;

    if (this.instance.wtSettings.settings.renderAllRows) {
      height = Infinity;
    }
    else {
      height = this.getViewportHeight();
    }

    var pos = Handsontable.Dom.getScrollTop(this.instance.wtOverlays.mainTableScrollableElement) - this.instance.wtOverlays.topOverlay.getTableParentOffset();
    if (pos < 0) {
      pos = 0;
    }

    var fixedRowsTop = this.instance.getSetting('fixedRowsTop');
    if(fixedRowsTop) {
      var fixedRowsHeight = this.instance.wtOverlays.topOverlay.sumCellSizes(0, fixedRowsTop);
      pos += fixedRowsHeight;
      height -= fixedRowsHeight;
    }

    var that = this;
    return new WalkontableViewportRowsCalculator(
        height,
        pos,
        this.instance.getSetting('totalRows'),
        function(sourceRow) {
          return that.instance.wtTable.getRowHeight(sourceRow);
        },
        visible ? null : this.instance.wtSettings.settings.viewportRowCalculatorOverride,
        visible ? true : false
    );
  };

  /**
   * Creates:
   *  - columnsRenderCalculator (before draw, to qualify columns for rendering)
   *  - columnsVisibleCalculator (after draw, to measure which columns are actually visible)
   *
   * @returns {WalkontableViewportRowsCalculator}
   */
  WalkontableViewport.prototype.createColumnsCalculator = function (visible) {
    this.columnHeaderHeight = NaN;

    var width = this.getViewportWidth();

    var pos = this.instance.wtOverlays.leftOverlay.getScrollPosition() - this.instance.wtOverlays.topOverlay.getTableParentOffset();
    if (pos < 0) {
      pos = 0;
    }

    var fixedColumnsLeft = this.instance.getSetting('fixedColumnsLeft');
    if(fixedColumnsLeft) {
      var fixedColumnsWidth = this.instance.wtOverlays.leftOverlay.sumCellSizes(0, fixedColumnsLeft);
      pos += fixedColumnsWidth;
      width -= fixedColumnsWidth;
    }

    if(this.instance.wtTable.holder.clientWidth !== this.instance.wtTable.holder.offsetWidth) {
      width -= Handsontable.Dom.getScrollbarWidth();
    }

    var that = this;
    return new WalkontableViewportColumnsCalculator(
        width,
        pos,
        this.instance.getSetting('totalColumns'),
        function (sourceCol) {
          return that.instance.wtTable.getColumnWidth(sourceCol);
        },
        visible ? null : this.instance.wtSettings.settings.viewportColumnCalculatorOverride,
        visible ? true : false,
        this.instance.getSetting('stretchH')
    );
  };


  /**
   * Creates rowsRenderCalculator and columnsRenderCalculator (before draw, to determine what rows and cols should be rendered)
   *
   * @param fastDraw {Boolean} If TRUE, will try to avoid full redraw and only update the border positions. If FALSE or UNDEFINED, will perform a full redraw
   * @returns fastDraw {Boolean} The fastDraw value, possibly modified
   */
  WalkontableViewport.prototype.createRenderCalculators = function (fastDraw) {
    if (fastDraw) {
      var proposedRowsVisibleCalculator = this.createRowsCalculator(true);
      var proposedColumnsVisibleCalculator = this.createColumnsCalculator(true);
      if (!(this.areAllProposedVisibleRowsAlreadyRendered(proposedRowsVisibleCalculator) && this.areAllProposedVisibleColumnsAlreadyRendered(proposedColumnsVisibleCalculator) ) ) {
        fastDraw = false;
      }
    }

    if(!fastDraw) {
      this.rowsRenderCalculator = this.createRowsCalculator();
      this.columnsRenderCalculator = this.createColumnsCalculator();
    }

    this.rowsVisibleCalculator = null; //delete temporarily to make sure that renderers always use rowsRenderCalculator, not rowsVisibleCalculator
    this.columnsVisibleCalculator = null;

    return fastDraw;
  };

  /**
   * Creates rowsVisibleCalculator and columnsVisibleCalculator (after draw, to determine what are the actually visible rows and columns)
   */
  WalkontableViewport.prototype.createVisibleCalculators = function () {
    this.rowsVisibleCalculator = this.createRowsCalculator(true);
    this.columnsVisibleCalculator = this.createColumnsCalculator(true);
  };

  /**
   * Returns information whether proposedRowsVisibleCalculator viewport
   * is contained inside rows rendered in previous draw (cached in rowsRenderCalculator)
   *
   * Returns TRUE if all proposed visible rows are already rendered (meaning: redraw is not needed)
   * Returns FALSE if at least one proposed visible row is not already rendered (meaning: redraw is needed)
   *
   * @returns {Boolean}
   */
  WalkontableViewport.prototype.areAllProposedVisibleRowsAlreadyRendered = function (proposedRowsVisibleCalculator) {
    if (this.rowsVisibleCalculator) {
      if (proposedRowsVisibleCalculator.startRow < this.rowsRenderCalculator.startRow ||
          (proposedRowsVisibleCalculator.startRow === this.rowsRenderCalculator.startRow &&
          proposedRowsVisibleCalculator.startRow > 0)) {
        return false;
      }
      else if (proposedRowsVisibleCalculator.endRow > this.rowsRenderCalculator.endRow ||
          (proposedRowsVisibleCalculator.endRow === this.rowsRenderCalculator.endRow &&
          proposedRowsVisibleCalculator.endRow < this.instance.getSetting('totalRows') - 1)) {
        return false;
      }
      else {
        return true;
      }
    }
    return false;
  };

  /**
   * Returns information whether proposedColumnsVisibleCalculator viewport
   * is contained inside column rendered in previous draw (cached in columnsRenderCalculator)
   *
   * Returns TRUE if all proposed visible columns are already rendered (meaning: redraw is not needed)
   * Returns FALSE if at least one proposed visible column is not already rendered (meaning: redraw is needed)
   *
   * @returns {Boolean}
   */
  WalkontableViewport.prototype.areAllProposedVisibleColumnsAlreadyRendered = function (proposedColumnsVisibleCalculator) {
    if (this.columnsVisibleCalculator) {
      if (proposedColumnsVisibleCalculator.startColumn < this.columnsRenderCalculator.startColumn ||
          (proposedColumnsVisibleCalculator.startColumn === this.columnsRenderCalculator.startColumn &&
          proposedColumnsVisibleCalculator.startColumn > 0)) {
        return false;
      }
      else if (proposedColumnsVisibleCalculator.endColumn > this.columnsRenderCalculator.endColumn ||
          (proposedColumnsVisibleCalculator.endColumn === this.columnsRenderCalculator.endColumn &&
          proposedColumnsVisibleCalculator.endColumn < this.instance.getSetting('totalColumns') - 1)) {
        return false;
      }
      else {
        return true;
      }
    }
    return false;
  };

  function WalkontableViewportColumnsCalculator (width, scrollOffset, totalColumns, columnWidthFn, overrideFn, onlyFullyVisible, stretchH) {
    var
        _this = this,
        ratio = 1,
        sum = 0,
        needReverse = true,
        defaultColumnWidth = 50,
        startPositions = [],
        getColumnWidth,
        columnWidth, i;

    this.scrollOffset = scrollOffset;
    this.startColumn = null;
    this.endColumn = null;
    this.startPosition = null;
    this.count = 0;
    this.stretchAllRatio = 0;
    this.stretchLastWidth = 0;
    this.stretch = stretchH;
    this.totalTargetWidth = 0;
    this.needVerifyLastColumnWidth = true;
    this.stretchAllColumnsWidth = [];


    function getStretchedAllColumnWidth(column, baseWidth) {
      var sumRatioWidth = 0;

      if (!_this.stretchAllColumnsWidth[column]) {
        _this.stretchAllColumnsWidth[column] = Math.round(baseWidth * _this.stretchAllRatio);
      }

      if (_this.stretchAllColumnsWidth.length === totalColumns && _this.needVerifyLastColumnWidth) {
        _this.needVerifyLastColumnWidth = false;

        for (var i = 0; i < _this.stretchAllColumnsWidth.length; i++) {
          sumRatioWidth += _this.stretchAllColumnsWidth[i];
        }
        if (sumRatioWidth != _this.totalTargetWidth) {
          _this.stretchAllColumnsWidth[_this.stretchAllColumnsWidth.length - 1] += _this.totalTargetWidth - sumRatioWidth;
        }
      }

      return _this.stretchAllColumnsWidth[column];
    }

    function getStretchedLastColumnWidth(column, baseWidth) {
      if (column === totalColumns - 1) {
        return _this.stretchLastWidth;
      }

      return null;
    }

    getColumnWidth = function getColumnWidth(i) {
      var width = columnWidthFn(i);

      ratio = ratio || 1;

      if (width === undefined) {
        width = defaultColumnWidth;
      }

      return width;
    };

    /**
     * Recalculate columns stretching.
     *
     * @param {Number} totalWidth
     */
    this.refreshStretching = function (totalWidth) {
      var sumAll = 0,
          columnWidth,
          remainingSize;

      for (var i = 0; i < totalColumns; i++) {
        columnWidth = getColumnWidth(i);
        sumAll += columnWidth;
      }
      this.totalTargetWidth = totalWidth;
      remainingSize = sumAll - totalWidth;

      if (this.stretch === 'all' && remainingSize < 0) {
        this.stretchAllRatio = totalWidth / sumAll;
        this.stretchAllColumnsWidth = [];
        this.needVerifyLastColumnWidth = true;
      }
      else if (this.stretch === 'last' && totalWidth !== Infinity) {
        this.stretchLastWidth = -remainingSize + getColumnWidth(totalColumns - 1);
      }
    };

    /**
     * Get stretched column width based on stretchH (all or last) setting passed in handsontable instance.
     *
     * @param {Number} column
     * @param {Number} baseWidth
     * @returns {Number|null}
     */
    this.getStretchedColumnWidth = function(column, baseWidth) {
      var result = null;

      if (this.stretch === 'all' && this.stretchAllRatio !== 0) {
        result = getStretchedAllColumnWidth(column, baseWidth);
      }
      else if (this.stretch === 'last' && this.stretchLastWidth !== 0) {
        result = getStretchedLastColumnWidth(column, baseWidth);
      }

      return result;
    };


    for (i = 0; i < totalColumns; i++) {
      columnWidth = getColumnWidth(i);

      if (sum <= scrollOffset && !onlyFullyVisible) {
        this.startColumn = i;
      }

      if (sum >= scrollOffset && sum + columnWidth <= scrollOffset + width) {
        if (this.startColumn == null) {
          this.startColumn = i;
        }
        this.endColumn = i;
      }
      startPositions.push(sum);
      sum += columnWidth;

      if (!onlyFullyVisible) {
        this.endColumn = i;
      }
      if (sum >= scrollOffset + width) {
        needReverse = false;
        break;
      }
    }

    if (this.endColumn == totalColumns - 1 && needReverse) {
      this.startColumn = this.endColumn;

      while (this.startColumn > 0) {
        var viewportSum = startPositions[this.endColumn] + columnWidth - startPositions[this.startColumn - 1];

        if (viewportSum <= width || !onlyFullyVisible) {
          this.startColumn--;
        }
        if (viewportSum > width) {
          break;
        }
      }
    }

    if (this.startColumn !== null && overrideFn) {
      overrideFn(this);
    }
    this.startPosition = startPositions[this.startColumn];

    if (this.startPosition == void 0) {
      this.startPosition = null;
    }
    if (this.startColumn != null) {
      this.count = this.endColumn - this.startColumn + 1;
    }
  }


  /**
   * Viewport calculator constructor. Calculates indexes of rows to render OR rows that are visible.
   * To redo the calculation, you need to create a new calculator.
   *
   * Object properties:
   *   this.scrollOffset - position of vertical scroll (in px)
   *   this.startRow - index of the first rendered/visible row (can be overwritten using overrideFn)
   *   this.startPosition - position of the first rendered/visible row (in px)
   *   this.endRow - index of the last rendered/visible row (can be overwritten using overrideFn)
   *   this.count - number of rendered/visible rows
   *
   * @param height - height of the viewport
   * @param scrollOffset - current vertical scroll position of the viewport
   * @param totalRows - total number of rows
   * @param rowHeightFn - function that returns the height of the row at a given index (in px)
   * @param overrideFn - function that changes calculated this.startRow, this.endRow (used by mergeCells.js plugin)
   * @param onlyFullyVisible {bool} - if TRUE, only startRow and endRow will be indexes of rows that are FULLY in viewport
   * @constructor
   * @private
   */
  function WalkontableViewportRowsCalculator(height, scrollOffset, totalRows, rowHeightFn, overrideFn, onlyFullyVisible) {
    this.scrollOffset = scrollOffset;
    this.startRow = null;
    this.startPosition = null;
    this.endRow = null;
    this.count = 0;
    var sum = 0;
    var rowHeight;
    var needReverse = true;
    var defaultRowHeight = 23;
    var startPositions = [];

    // Calculate the number (start and end index) of rows needed
    for (var i = 0; i < totalRows; i++) {
      rowHeight = rowHeightFn(i);
      if (rowHeight === undefined) {
        rowHeight = defaultRowHeight;
      }
      if (sum <= scrollOffset && !onlyFullyVisible) {
        this.startRow = i;
      }

      // the row is within the "visible range"
      if (sum >= scrollOffset && sum + rowHeight <= scrollOffset + height) {
        if (this.startRow == null) {
          this.startRow = i;
        }
        this.endRow = i;
      }
      startPositions.push(sum);
      sum += rowHeight;
      if(!onlyFullyVisible) {
        this.endRow = i;
      }
      if (sum >= scrollOffset + height) {
        needReverse = false;
        break;
      }
    }

    //If the estimation has reached the last row and there is still some space available in the viewport, we need to render in reverse in order to fill the whole viewport with rows
    if (this.endRow == totalRows - 1 && needReverse) {
      this.startRow = this.endRow;
      while(this.startRow > 0) {
        var viewportSum = startPositions[this.endRow] + rowHeight - startPositions[this.startRow - 1]; //rowHeight is the height of the last row
        if (viewportSum <= height || !onlyFullyVisible)
        {
          this.startRow--;
        }
        if (viewportSum >= height)
        {
          break;
        }
      }
    }

    if (this.startRow !== null && overrideFn) {
      overrideFn(this);
    }

    this.startPosition = startPositions[this.startRow];
    if (this.startPosition == void 0) {
      this.startPosition = null;
    }

    if (this.startRow != null) {
      this.count = this.endRow - this.startRow + 1;
    }
  }

  function WalkontableCornerOverlay(instance) {
    this.instance = instance;
    this.type = 'corner';
    this.init();
    this.clone = this.makeClone('corner');
  }

  WalkontableCornerOverlay.prototype = new WalkontableOverlay();

  WalkontableCornerOverlay.prototype.resetFixedPosition = function () {
    if (!this.instance.wtTable.holder.parentNode) {
      return; //removed from DOM
    }
    var elem = this.clone.wtTable.holder.parentNode,
        finalLeft,
        finalTop;

    if (this.trimmingContainer === window) {
      var box = this.instance.wtTable.hider.getBoundingClientRect();
      var top = Math.ceil(box.top);
      var left = Math.ceil(box.left);
      var bottom = Math.ceil(box.bottom);
      var right = Math.ceil(box.right);

      if (left < 0 && (right - elem.offsetWidth) > 0) {
        finalLeft = -left + 'px';
      } else {
        finalLeft = '0';
      }

      if (top < 0 && (bottom - elem.offsetHeight) > 0) {
        finalTop = -top + "px";
      } else {
        finalTop = "0";
      }

      Handsontable.Dom.setOverlayPosition(elem, finalLeft, finalTop);
    }


    var tableHeight = Handsontable.Dom.outerHeight(this.clone.wtTable.TABLE);
    var tableWidth = Handsontable.Dom.outerWidth(this.clone.wtTable.TABLE);
    elem.style.height = (tableHeight === 0 ? tableHeight : tableHeight + 4) + 'px';
    elem.style.width = (tableWidth === 0 ? tableWidth : tableWidth + 4) + 'px';
  };

  function WalkontableLeftOverlay(instance) {
    this.instance = instance;
    this.type = 'horizontal';
    this.offset = 0;
    this.init();
    this.clone = this.makeClone('left');
  }

  WalkontableLeftOverlay.prototype = new WalkontableOverlay();

//resetFixedPosition (in future merge it with this.refresh?)
  WalkontableLeftOverlay.prototype.resetFixedPosition = function () {
    var finalLeft, finalTop;

    if (!this.instance.wtTable.holder.parentNode) {
      return; //removed from DOM
    }
    var elem = this.clone.wtTable.holder.parentNode,
        scrollbarHeight = this.instance.wtTable.holder.clientHeight !== this.instance.wtTable.holder.offsetHeight ? Handsontable.Dom.getScrollbarWidth() : 0,
        scrollbarWidth = this.instance.wtTable.holder.clientWidth !== this.instance.wtTable.holder.offsetWidth ? Handsontable.Dom.getScrollbarWidth() : 0;

    if (this.instance.wtOverlays.leftOverlay.trimmingContainer !== window) {
      elem.style.height = this.instance.wtViewport.getWorkspaceHeight() - scrollbarHeight + 'px';
    } else {

      var box = this.instance.wtTable.hider.getBoundingClientRect();
      var left = Math.ceil(box.left);
      var right = Math.ceil(box.right);

      if (left < 0 && (right - elem.offsetWidth) > 0) {
        finalLeft = -left + 'px';
      } else {
        finalLeft = '0';
      }

      finalTop = this.instance.wtTable.hider.style.top;
      finalTop = finalTop === "" ? 0 : finalTop;

      Handsontable.Dom.setOverlayPosition(elem, finalLeft, finalTop);
    }

    var tableWidth = Handsontable.Dom.outerWidth(this.clone.wtTable.TABLE);
    var elemWidth = (tableWidth === 0 ? tableWidth : tableWidth + 4);
    elem.style.width = elemWidth + 'px';

    this.clone.wtTable.holder.style.width = elemWidth + scrollbarWidth + 'px';
  };

  WalkontableLeftOverlay.prototype.refresh = function (fastDraw) {
    this.applyToDOM();
    WalkontableOverlay.prototype.refresh.call(this, fastDraw);
  };

  WalkontableLeftOverlay.prototype.getScrollPosition = function () {
    return Handsontable.Dom.getScrollLeft(this.mainTableScrollableElement);
  };

  WalkontableLeftOverlay.prototype.setScrollPosition = function (pos) {
    if (this.mainTableScrollableElement === window) {
      window.scrollTo(pos, Handsontable.Dom.getWindowScrollTop());
    } else {
      this.mainTableScrollableElement.scrollLeft = pos;
    }
  };

  WalkontableLeftOverlay.prototype.onScroll = function () {
    this.instance.getSetting('onScrollHorizontally');
  };

  WalkontableLeftOverlay.prototype.sumCellSizes = function (from, length) {
    var sum = 0;
    while(from < length) {
      sum += this.instance.wtTable.getStretchedColumnWidth(from) || this.instance.wtSettings.defaultColumnWidth;
      from++;
    }
    return sum;
  };

//applyToDOM (in future merge it with this.refresh?)
  /**
   * Adjust the overlay dimensions and position
   */
  WalkontableLeftOverlay.prototype.applyToDOM = function () {
    var total = this.instance.getSetting('totalColumns'),
        headerSize = this.instance.wtViewport.getRowHeaderWidth(),
        cloneHolder = this.clone.wtTable.holder,
        cloneHider = this.clone.wtTable.hider,
        masterHider = this.hider,
        cloneHolderParent = cloneHolder.parentNode,
        scrollbarWidth = Handsontable.Dom.getScrollbarWidth(true);

    masterHider.style.width = headerSize + this.sumCellSizes(0, total) + 'px';

    cloneHolder.style.width = parseInt(cloneHolderParent.style.width,10) + scrollbarWidth + 'px';

    cloneHider.style.height = masterHider.style.height;

    cloneHolder.style.height = cloneHolderParent.style.height;

    if (typeof this.instance.wtViewport.columnsRenderCalculator.startPosition === 'number'){
      this.spreader.style.left = this.instance.wtViewport.columnsRenderCalculator.startPosition + 'px';
    }
    else if (total === 0) {
      this.spreader.style.left = '0';
    } else {
      throw  new Error('Incorrect value of the columnsRenderCalculator');
    }
    this.spreader.style.right = '';

    this.syncOverlayOffset();
  };

  WalkontableLeftOverlay.prototype.syncOverlayOffset = function () {
    if (typeof this.instance.wtViewport.rowsRenderCalculator.startPosition === 'number'){
      this.clone.wtTable.spreader.style.top = this.instance.wtViewport.rowsRenderCalculator.startPosition + 'px';
    } else {
      this.clone.wtTable.spreader.style.top = '';
    }
  };

  /**
   * Scrolls horizontally to a column at the left edge of the viewport
   * @param sourceCol {Number}
   * @param beyondRendered {Boolean} if TRUE, scrolls according to the bottom edge (top edge is by default)
   */
  WalkontableLeftOverlay.prototype.scrollTo = function (sourceCol, beyondRendered) {
    var newX = this.getTableParentOffset(),
        sourceInstance = this.instance.cloneSource ? this.instance.cloneSource : this.instance,
        mainHolder = sourceInstance.wtTable.holder,
        scrollbarCompensation = 0;

    if(beyondRendered && mainHolder.offsetWidth !== mainHolder.clientWidth) {
      scrollbarCompensation = Handsontable.Dom.getScrollbarWidth();
    }

    if (beyondRendered) {
      newX += this.sumCellSizes(0, sourceCol + 1);
      newX -= this.instance.wtViewport.getViewportWidth();
    }
    else {
      var fixedColumnsLeft = this.instance.getSetting('fixedColumnsLeft');
      newX += this.sumCellSizes(fixedColumnsLeft, sourceCol);
    }

    newX += scrollbarCompensation;

    this.setScrollPosition(newX);
  };

  WalkontableLeftOverlay.prototype.getTableParentOffset = function () {
    if (this.trimmingContainer === window) {
      return this.instance.wtTable.holderOffset.left;
    }
    else {
      return 0;
    }
  };

  function WalkontableTopOverlay(instance) {
    this.instance = instance;
    this.type = 'vertical';
    this.init();
    this.clone = this.makeClone('top');
  }

  WalkontableTopOverlay.prototype = new WalkontableOverlay();

//resetFixedPosition (in future merge it with this.refresh?)
  WalkontableTopOverlay.prototype.resetFixedPosition = function () {
    var finalLeft, finalTop;

    if (!this.instance.wtTable.holder.parentNode) {
      return; //removed from DOM
    }
    var elem = this.clone.wtTable.holder.parentNode,
        scrollbarWidth = this.instance.wtTable.holder.clientWidth !== this.instance.wtTable.holder.offsetWidth ? Handsontable.Dom.getScrollbarWidth() : 0;

    if (this.instance.wtOverlays.leftOverlay.trimmingContainer !== window) {
      elem.style.width = this.instance.wtViewport.getWorkspaceWidth() - scrollbarWidth + 'px';
    } else {
      var box = this.instance.wtTable.hider.getBoundingClientRect();
      var top = Math.ceil(box.top);
      var bottom = Math.ceil(box.bottom);

      finalLeft = this.instance.wtTable.hider.style.left;
      finalLeft = finalLeft === "" ? 0 : finalLeft;

      if (top < 0 && (bottom - elem.offsetHeight) > 0) {
        finalTop = -top + "px";
      } else {
        finalTop = "0";
      }

      Handsontable.Dom.setOverlayPosition(elem, finalLeft, finalTop);
    }

    this.clone.wtTable.holder.style.width = elem.style.width;

    var tableHeight = Handsontable.Dom.outerHeight(this.clone.wtTable.TABLE);
    elem.style.height = (tableHeight === 0 ? tableHeight : tableHeight + 4) + 'px';
  };

  WalkontableTopOverlay.prototype.getScrollPosition = function () {
    return Handsontable.Dom.getScrollTop(this.mainTableScrollableElement);
  };

  WalkontableTopOverlay.prototype.setScrollPosition = function (pos) {
    if (this.mainTableScrollableElement === window){
      window.scrollTo(Handsontable.Dom.getWindowScrollLeft(), pos);
    } else {
      this.mainTableScrollableElement.scrollTop = pos;
    }
  };

  WalkontableTopOverlay.prototype.onScroll = function () {
    this.instance.getSetting('onScrollVertically');
  };

  WalkontableTopOverlay.prototype.sumCellSizes = function (from, length) {
    var sum = 0;
    while (from < length) {
      sum += this.instance.wtTable.getRowHeight(from) || this.instance.wtSettings.settings.defaultRowHeight; //TODO optimize getSetting, because this is MUCH faster then getSetting
      from++;
    }
    return sum;
  };

  WalkontableTopOverlay.prototype.refresh = function (fastDraw) {
    this.applyToDOM();
    WalkontableOverlay.prototype.refresh.call(this, fastDraw);
  };

//applyToDOM (in future merge it with this.refresh?)
  WalkontableTopOverlay.prototype.applyToDOM = function () {
    var total = this.instance.getSetting('totalRows');
    var headerSize = this.instance.wtViewport.getColumnHeaderHeight();
    var scrollbarWidth = Handsontable.Dom.getScrollbarWidth(true);

    var totalEstimatedHeight = headerSize + this.sumCellSizes(0, total) + 1 +  'px';

    this.hider.style.height = totalEstimatedHeight;

    this.clone.wtTable.hider.style.width = this.hider.style.width;

    this.clone.wtTable.holder.style.width = this.clone.wtTable.holder.parentNode.style.width;

    this.clone.wtTable.holder.style.height = parseInt(this.clone.wtTable.holder.parentNode.style.height,10) + scrollbarWidth + 'px';

    if (typeof this.instance.wtViewport.rowsRenderCalculator.startPosition === 'number') {
      this.spreader.style.top = this.instance.wtViewport.rowsRenderCalculator.startPosition + 'px';
    }
    else if (total === 0) {
      this.spreader.style.top = '0'; //can happen if there are 0 rows
    }
    else {
      throw new Error("Incorrect value of the rowsRenderCalculator");
    }
    this.spreader.style.bottom = '';

    this.syncOverlayOffset();
  };

  WalkontableTopOverlay.prototype.syncOverlayOffset = function () {
    if (typeof this.instance.wtViewport.columnsRenderCalculator.startPosition === 'number'){
      this.clone.wtTable.spreader.style.left = this.instance.wtViewport.columnsRenderCalculator.startPosition + 'px';
    } else {
      this.clone.wtTable.spreader.style.left = '';
    }
  };

  /**
   * Scrolls vertically to a row
   *
   * @param sourceRow {Number}
   * @param bottomEdge {Boolean} if TRUE, scrolls according to the bottom edge (top edge is by default)
   */
  WalkontableTopOverlay.prototype.scrollTo = function (sourceRow, bottomEdge) {
    var newY = this.getTableParentOffset(),
        sourceInstance = this.instance.cloneSource ? this.instance.cloneSource : this.instance,
        mainHolder = sourceInstance.wtTable.holder,
        scrollbarCompensation = 0;

    if(bottomEdge && mainHolder.offsetHeight !== mainHolder.clientHeight) {
      scrollbarCompensation = Handsontable.Dom.getScrollbarWidth();
    }

    if (bottomEdge) {
      newY += this.sumCellSizes(0, sourceRow + 1);
      newY -= this.instance.wtViewport.getViewportHeight();
      // Fix 1 pixel offset when cell is selected
      newY += 1;
    }
    else {
      var fixedRowsTop = this.instance.getSetting('fixedRowsTop');
      newY += this.sumCellSizes(fixedRowsTop, sourceRow);
    }

    newY += scrollbarCompensation;

    this.setScrollPosition(newY);
  };

  WalkontableTopOverlay.prototype.getTableParentOffset = function () {
    if (this.mainTableScrollableElement === window) {
      return this.instance.wtTable.holderOffset.top;
    }
    else {
      return 0;
    }
  };

  if (window.jQuery) {
    (function (window, $, Handsontable) {
      $.fn.handsontable = function (action) {
        var i
            , ilen
            , args
            , output
            , userSettings
            , $this = this.first() // Use only first element from list
            , instance = $this.data('handsontable');

        // Init case
        if (typeof action !== 'string') {
          userSettings = action || {};
          if (instance) {
            instance.updateSettings(userSettings);
          }
          else {
            instance = new Handsontable.Core($this[0], userSettings);
            $this.data('handsontable', instance);
            instance.init();
          }

          return $this;
        }
        // Action case
        else {
          args = [];
          if (arguments.length > 1) {
            for (i = 1, ilen = arguments.length; i < ilen; i++) {
              args.push(arguments[i]);
            }
          }

          if (instance) {
            if (typeof instance[action] !== 'undefined') {
              output = instance[action].apply(instance, args);

              if (action === 'destroy'){
                $this.removeData();
              }
            }
            else {
              throw new Error('Handsontable do not provide action: ' + action);
            }
          }

          return output;
        }
      };
    })(window, jQuery, Handsontable);
  }



})(window, Handsontable);

/*!
 * numeral.js
 * version : 1.5.3
 * author : Adam Draper
 * license : MIT
 * http://adamwdraper.github.com/Numeral-js/
 */

(function() {

  /************************************
   Constants
   ************************************/

  var numeral,
      VERSION = '1.5.3',
  // internal storage for language config files
      languages = {},
      currentLanguage = 'en',
      zeroFormat = null,
      defaultFormat = '0,0',
  // check for nodeJS
      hasModule = (typeof module !== 'undefined' && module.exports);


  /************************************
   Constructors
   ************************************/


  // Numeral prototype object
  function Numeral(number) {
    this._value = number;
  }

  /**
   * Implementation of toFixed() that treats floats more like decimals
   *
   * Fixes binary rounding issues (eg. (0.615).toFixed(2) === '0.61') that present
   * problems for accounting- and finance-related software.
   */
  function toFixed(value, precision, roundingFunction, optionals) {
    var power = Math.pow(10, precision),
        optionalsRegExp,
        output;

    //roundingFunction = (roundingFunction !== undefined ? roundingFunction : Math.round);
    // Multiply up by precision, round accurately, then divide and use native toFixed():
    output = (roundingFunction(value * power) / power).toFixed(precision);

    if (optionals) {
      optionalsRegExp = new RegExp('0{1,' + optionals + '}$');
      output = output.replace(optionalsRegExp, '');
    }

    return output;
  }

  /************************************
   Formatting
   ************************************/

  // determine what type of formatting we need to do
  function formatNumeral(n, format, roundingFunction) {
    var output;

    // figure out what kind of format we are dealing with
    if (format.indexOf('$') > -1) { // currency!!!!!
      output = formatCurrency(n, format, roundingFunction);
    } else if (format.indexOf('%') > -1) { // percentage
      output = formatPercentage(n, format, roundingFunction);
    } else if (format.indexOf(':') > -1) { // time
      output = formatTime(n, format);
    } else { // plain ol' numbers or bytes
      output = formatNumber(n._value, format, roundingFunction);
    }

    // return string
    return output;
  }

  // revert to number
  function unformatNumeral(n, string) {
    var stringOriginal = string,
        thousandRegExp,
        millionRegExp,
        billionRegExp,
        trillionRegExp,
        suffixes = ['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
        bytesMultiplier = false,
        power;

    if (string.indexOf(':') > -1) {
      n._value = unformatTime(string);
    } else {
      if (string === zeroFormat) {
        n._value = 0;
      } else {
        if (languages[currentLanguage].delimiters.decimal !== '.') {
          string = string.replace(/\./g, '').replace(languages[currentLanguage].delimiters.decimal, '.');
        }

        // see if abbreviations are there so that we can multiply to the correct number
        thousandRegExp = new RegExp('[^a-zA-Z]' + languages[currentLanguage].abbreviations.thousand + '(?:\\)|(\\' + languages[currentLanguage].currency.symbol + ')?(?:\\))?)?$');
        millionRegExp = new RegExp('[^a-zA-Z]' + languages[currentLanguage].abbreviations.million + '(?:\\)|(\\' + languages[currentLanguage].currency.symbol + ')?(?:\\))?)?$');
        billionRegExp = new RegExp('[^a-zA-Z]' + languages[currentLanguage].abbreviations.billion + '(?:\\)|(\\' + languages[currentLanguage].currency.symbol + ')?(?:\\))?)?$');
        trillionRegExp = new RegExp('[^a-zA-Z]' + languages[currentLanguage].abbreviations.trillion + '(?:\\)|(\\' + languages[currentLanguage].currency.symbol + ')?(?:\\))?)?$');

        // see if bytes are there so that we can multiply to the correct number
        for (power = 0; power <= suffixes.length; power++) {
          bytesMultiplier = (string.indexOf(suffixes[power]) > -1) ? Math.pow(1024, power + 1) : false;

          if (bytesMultiplier) {
            break;
          }
        }

        // do some math to create our number
        n._value = ((bytesMultiplier) ? bytesMultiplier : 1) * ((stringOriginal.match(thousandRegExp)) ? Math.pow(10, 3) : 1) * ((stringOriginal.match(millionRegExp)) ? Math.pow(10, 6) : 1) * ((stringOriginal.match(billionRegExp)) ? Math.pow(10, 9) : 1) * ((stringOriginal.match(trillionRegExp)) ? Math.pow(10, 12) : 1) * ((string.indexOf('%') > -1) ? 0.01 : 1) * (((string.split('-').length + Math.min(string.split('(').length - 1, string.split(')').length - 1)) % 2) ? 1 : -1) * Number(string.replace(/[^0-9\.]+/g, ''));

        // round if we are talking about bytes
        n._value = (bytesMultiplier) ? Math.ceil(n._value) : n._value;
      }
    }
    return n._value;
  }

  function formatCurrency(n, format, roundingFunction) {
    var symbolIndex = format.indexOf('$'),
        openParenIndex = format.indexOf('('),
        minusSignIndex = format.indexOf('-'),
        space = '',
        spliceIndex,
        output;

    // check for space before or after currency
    if (format.indexOf(' $') > -1) {
      space = ' ';
      format = format.replace(' $', '');
    } else if (format.indexOf('$ ') > -1) {
      space = ' ';
      format = format.replace('$ ', '');
    } else {
      format = format.replace('$', '');
    }

    // format the number
    output = formatNumber(n._value, format, roundingFunction);

    // position the symbol
    if (symbolIndex <= 1) {
      if (output.indexOf('(') > -1 || output.indexOf('-') > -1) {
        output = output.split('');
        spliceIndex = 1;
        if (symbolIndex < openParenIndex || symbolIndex < minusSignIndex) {
          // the symbol appears before the "(" or "-"
          spliceIndex = 0;
        }
        output.splice(spliceIndex, 0, languages[currentLanguage].currency.symbol + space);
        output = output.join('');
      } else {
        output = languages[currentLanguage].currency.symbol + space + output;
      }
    } else {
      if (output.indexOf(')') > -1) {
        output = output.split('');
        output.splice(-1, 0, space + languages[currentLanguage].currency.symbol);
        output = output.join('');
      } else {
        output = output + space + languages[currentLanguage].currency.symbol;
      }
    }

    return output;
  }

  function formatPercentage(n, format, roundingFunction) {
    var space = '',
        output,
        value = n._value * 100;

    // check for space before %
    if (format.indexOf(' %') > -1) {
      space = ' ';
      format = format.replace(' %', '');
    } else {
      format = format.replace('%', '');
    }

    output = formatNumber(value, format, roundingFunction);

    if (output.indexOf(')') > -1) {
      output = output.split('');
      output.splice(-1, 0, space + '%');
      output = output.join('');
    } else {
      output = output + space + '%';
    }

    return output;
  }

  function formatTime(n) {
    var hours = Math.floor(n._value / 60 / 60),
        minutes = Math.floor((n._value - (hours * 60 * 60)) / 60),
        seconds = Math.round(n._value - (hours * 60 * 60) - (minutes * 60));
    return hours + ':' + ((minutes < 10) ? '0' + minutes : minutes) + ':' + ((seconds < 10) ? '0' + seconds : seconds);
  }

  function unformatTime(string) {
    var timeArray = string.split(':'),
        seconds = 0;
    // turn hours and minutes into seconds and add them all up
    if (timeArray.length === 3) {
      // hours
      seconds = seconds + (Number(timeArray[0]) * 60 * 60);
      // minutes
      seconds = seconds + (Number(timeArray[1]) * 60);
      // seconds
      seconds = seconds + Number(timeArray[2]);
    } else if (timeArray.length === 2) {
      // minutes
      seconds = seconds + (Number(timeArray[0]) * 60);
      // seconds
      seconds = seconds + Number(timeArray[1]);
    }
    return Number(seconds);
  }

  function formatNumber(value, format, roundingFunction) {
    var negP = false,
        signed = false,
        optDec = false,
        abbr = '',
        abbrK = false, // force abbreviation to thousands
        abbrM = false, // force abbreviation to millions
        abbrB = false, // force abbreviation to billions
        abbrT = false, // force abbreviation to trillions
        abbrForce = false, // force abbreviation
        bytes = '',
        ord = '',
        abs = Math.abs(value),
        suffixes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
        min,
        max,
        power,
        w,
        precision,
        thousands,
        d = '',
        neg = false;

    // check if number is zero and a custom zero format has been set
    if (value === 0 && zeroFormat !== null) {
      return zeroFormat;
    } else {
      // see if we should use parentheses for negative number or if we should prefix with a sign
      // if both are present we default to parentheses
      if (format.indexOf('(') > -1) {
        negP = true;
        format = format.slice(1, - 1);
      } else if (format.indexOf('+') > -1) {
        signed = true;
        format = format.replace(/\+/g, '');
      }

      // see if abbreviation is wanted
      if (format.indexOf('a') > -1) {
        // check if abbreviation is specified
        abbrK = format.indexOf('aK') >= 0;
        abbrM = format.indexOf('aM') >= 0;
        abbrB = format.indexOf('aB') >= 0;
        abbrT = format.indexOf('aT') >= 0;
        abbrForce = abbrK || abbrM || abbrB || abbrT;

        // check for space before abbreviation
        if (format.indexOf(' a') > -1) {
          abbr = ' ';
          format = format.replace(' a', '');
        } else {
          format = format.replace('a', '');
        }

        if (abs >= Math.pow(10, 12) && !abbrForce || abbrT) {
          // trillion
          abbr = abbr + languages[currentLanguage].abbreviations.trillion;
          value = value / Math.pow(10, 12);
        } else if (abs < Math.pow(10, 12) && abs >= Math.pow(10, 9) && !abbrForce || abbrB) {
          // billion
          abbr = abbr + languages[currentLanguage].abbreviations.billion;
          value = value / Math.pow(10, 9);
        } else if (abs < Math.pow(10, 9) && abs >= Math.pow(10, 6) && !abbrForce || abbrM) {
          // million
          abbr = abbr + languages[currentLanguage].abbreviations.million;
          value = value / Math.pow(10, 6);
        } else if (abs < Math.pow(10, 6) && abs >= Math.pow(10, 3) && !abbrForce || abbrK) {
          // thousand
          abbr = abbr + languages[currentLanguage].abbreviations.thousand;
          value = value / Math.pow(10, 3);
        }
      }

      // see if we are formatting bytes
      if (format.indexOf('b') > -1) {
        // check for space before
        if (format.indexOf(' b') > -1) {
          bytes = ' ';
          format = format.replace(' b', '');
        } else {
          format = format.replace('b', '');
        }

        for (power = 0; power <= suffixes.length; power++) {
          min = Math.pow(1024, power);
          max = Math.pow(1024, power + 1);

          if (value >= min && value < max) {
            bytes = bytes + suffixes[power];
            if (min > 0) {
              value = value / min;
            }
            break;
          }
        }
      }

      // see if ordinal is wanted
      if (format.indexOf('o') > -1) {
        // check for space before
        if (format.indexOf(' o') > -1) {
          ord = ' ';
          format = format.replace(' o', '');
        } else {
          format = format.replace('o', '');
        }

        ord = ord + languages[currentLanguage].ordinal(value);
      }

      if (format.indexOf('[.]') > -1) {
        optDec = true;
        format = format.replace('[.]', '.');
      }

      w = value.toString().split('.')[0];
      precision = format.split('.')[1];
      thousands = format.indexOf(',');

      if (precision) {
        if (precision.indexOf('[') > -1) {
          precision = precision.replace(']', '');
          precision = precision.split('[');
          d = toFixed(value, (precision[0].length + precision[1].length), roundingFunction, precision[1].length);
        } else {
          d = toFixed(value, precision.length, roundingFunction);
        }

        w = d.split('.')[0];

        if (d.split('.')[1].length) {
          d = languages[currentLanguage].delimiters.decimal + d.split('.')[1];
        } else {
          d = '';
        }

        if (optDec && Number(d.slice(1)) === 0) {
          d = '';
        }
      } else {
        w = toFixed(value, null, roundingFunction);
      }

      // format number
      if (w.indexOf('-') > -1) {
        w = w.slice(1);
        neg = true;
      }

      if (thousands > -1) {
        w = w.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1' + languages[currentLanguage].delimiters.thousands);
      }

      if (format.indexOf('.') === 0) {
        w = '';
      }

      return ((negP && neg) ? '(' : '') + ((!negP && neg) ? '-' : '') + ((!neg && signed) ? '+' : '') + w + d + ((ord) ? ord : '') + ((abbr) ? abbr : '') + ((bytes) ? bytes : '') + ((negP && neg) ? ')' : '');
    }
  }

  /************************************
   Top Level Functions
   ************************************/

  numeral = function(input) {
    if (numeral.isNumeral(input)) {
      input = input.value();
    } else if (input === 0 || typeof input === 'undefined') {
      input = 0;
    } else if (!Number(input)) {
      input = numeral.fn.unformat(input);
    }

    return new Numeral(Number(input));
  };

  // version number
  numeral.version = VERSION;

  // compare numeral object
  numeral.isNumeral = function(obj) {
    return obj instanceof Numeral;
  };

  // This function will load languages and then set the global language.  If
  // no arguments are passed in, it will simply return the current global
  // language key.
  numeral.language = function(key, values) {
    if (!key) {
      return currentLanguage;
    }

    key = key.toLowerCase();

    if (key && !values) {
      if (!languages[key]) {
        throw new Error('Unknown language : ' + key);
      }
      currentLanguage = key;
    }

    if (values || !languages[key]) {
      loadLanguage(key, values);
    }

    return numeral;
  };

  // This function provides access to the loaded language data.  If
  // no arguments are passed in, it will simply return the current
  // global language object.
  numeral.languageData = function(key) {
    if (!key) {
      return languages[currentLanguage];
    }

    if (!languages[key]) {
      throw new Error('Unknown language : ' + key);
    }

    return languages[key];
  };

  numeral.language('en', {
    delimiters: {
      thousands: ',',
      decimal: '.'
    },
    abbreviations: {
      thousand: 'k',
      million: 'm',
      billion: 'b',
      trillion: 't'
    },
    ordinal: function(number) {
      var b = number % 10;
      return (~~ (number % 100 / 10) === 1) ? 'th' : (b === 1) ? 'st' : (b === 2) ? 'nd' : (b === 3) ? 'rd' : 'th';
    },
    currency: {
      symbol: '$'
    }
  });

  numeral.zeroFormat = function(format) {
    zeroFormat = typeof(format) === 'string' ? format : null;
  };

  numeral.defaultFormat = function(format) {
    defaultFormat = typeof(format) === 'string' ? format : '0.0';
  };

  numeral.validate = function(val, culture) {

    var _decimalSep,
        _thousandSep,
        _currSymbol,
        _valArray,
        _abbrObj,
        _thousandRegEx,
        languageData,
        temp;

    //coerce val to string
    if (typeof val !== 'string') {
      val += '';
      if (console.warn) {
        console.warn('Numeral.js: Value is not string. It has been co-erced to: ', val);
      }
    }

    //trim whitespaces from either sides
    val = val.trim();


    //if val is empty return false
    if (val === '') {
      return false;
    }

    //replace the initial '+' or '-' sign if present
    val = val.replace(/^[+-]?/, '');


    //get the decimal and thousands separator from numeral.languageData
    try {
      //check if the culture is understood by numeral. if not, default it to current language
      languageData = numeral.languageData(culture);
    } catch (e) {
      languageData = numeral.languageData(numeral.language());
    }

    //setup the delimiters and currency symbol based on culture/language
    _currSymbol = languageData.currency.symbol;
    _abbrObj = languageData.abbreviations;
    _decimalSep = languageData.delimiters.decimal;
    if (languageData.delimiters.thousands === '.') {
      _thousandSep = '\\.';
    } else {
      _thousandSep = languageData.delimiters.thousands;
    }

    //validating currency symbol
    temp = val.match(/^[^\d]+/);
    if (temp !== null) {
      //chuck the currency symbol away
      val = val.substr(1);
      if (temp[0] !== _currSymbol) {
        return false;
      }
    }

    //validating abbreviation symbol
    temp = val.match(/[^\d]+$/);
    if (temp !== null) {
      val = val.slice(0, - 1);
      if (temp[0] !== _abbrObj.thousand && temp[0] !== _abbrObj.million && temp[0] !== _abbrObj.billion && temp[0] !== _abbrObj.trillion) {
        return false;
      }
    }

    //if val is just digits the return true
    if ( !! val.match(/^\d+$/)) {
      return true;
    }
    _thousandRegEx = new RegExp(_thousandSep + '{2}');

    if (!val.match(/[^\d.,]/g)) {
      _valArray = val.split(_decimalSep);
      if (_valArray.length > 2) {
        return false;
      } else {
        if (_valArray.length < 2) {
          return ( !! _valArray[0].match(/^\d+.*\d$/) && !_valArray[0].match(_thousandRegEx));
        } else {
          if (_valArray[0].length === 1) {
            return ( !! _valArray[0].match(/^\d+$/) && !_valArray[0].match(_thousandRegEx) && !! _valArray[1].match(/^\d+$/));
          } else {
            return ( !! _valArray[0].match(/^\d+.*\d$/) && !_valArray[0].match(_thousandRegEx) && !! _valArray[1].match(/^\d+$/));
          }
        }
      }
    }

    return false;
  };

  /************************************
   Helpers
   ************************************/

  function loadLanguage(key, values) {
    languages[key] = values;
  }

  /************************************
   Floating-point helpers
   ************************************/

  // The floating-point helper functions and implementation
  // borrows heavily from sinful.js: http://guipn.github.io/sinful.js/

  /**
   * Array.prototype.reduce for browsers that don't support it
   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce#Compatibility
   */
  if ('function' !== typeof Array.prototype.reduce) {
    Array.prototype.reduce = function(callback, opt_initialValue) {
      'use strict';

      if (null === this || 'undefined' === typeof this) {
        // At the moment all modern browsers, that support strict mode, have
        // native implementation of Array.prototype.reduce. For instance, IE8
        // does not support strict mode, so this check is actually useless.
        throw new TypeError('Array.prototype.reduce called on null or undefined');
      }

      if ('function' !== typeof callback) {
        throw new TypeError(callback + ' is not a function');
      }

      var index,
          value,
          length = this.length >>> 0,
          isValueSet = false;

      if (1 < arguments.length) {
        value = opt_initialValue;
        isValueSet = true;
      }

      for (index = 0; length > index; ++index) {
        if (this.hasOwnProperty(index)) {
          if (isValueSet) {
            value = callback(value, this[index], index, this);
          } else {
            value = this[index];
            isValueSet = true;
          }
        }
      }

      if (!isValueSet) {
        throw new TypeError('Reduce of empty array with no initial value');
      }

      return value;
    };
  }


  /**
   * Computes the multiplier necessary to make x >= 1,
   * effectively eliminating miscalculations caused by
   * finite precision.
   */
  function multiplier(x) {
    var parts = x.toString().split('.');
    if (parts.length < 2) {
      return 1;
    }
    return Math.pow(10, parts[1].length);
  }

  /**
   * Given a variable number of arguments, returns the maximum
   * multiplier that must be used to normalize an operation involving
   * all of them.
   */
  function correctionFactor() {
    var args = Array.prototype.slice.call(arguments);
    return args.reduce(function(prev, next) {
      var mp = multiplier(prev),
          mn = multiplier(next);
      return mp > mn ? mp : mn;
    }, - Infinity);
  }


  /************************************
   Numeral Prototype
   ************************************/


  numeral.fn = Numeral.prototype = {

    clone: function() {
      return numeral(this);
    },

    format: function(inputString, roundingFunction) {
      return formatNumeral(this,
          inputString ? inputString : defaultFormat, (roundingFunction !== undefined) ? roundingFunction : Math.round);
    },

    unformat: function(inputString) {
      if (Object.prototype.toString.call(inputString) === '[object Number]') {
        return inputString;
      }
      return unformatNumeral(this, inputString ? inputString : defaultFormat);
    },

    value: function() {
      return this._value;
    },

    valueOf: function() {
      return this._value;
    },

    set: function(value) {
      this._value = Number(value);
      return this;
    },

    add: function(value) {
      var corrFactor = correctionFactor.call(null, this._value, value);

      function cback(accum, curr, currI, O) {
        return accum + corrFactor * curr;
      }
      this._value = [this._value, value].reduce(cback, 0) / corrFactor;
      return this;
    },

    subtract: function(value) {
      var corrFactor = correctionFactor.call(null, this._value, value);

      function cback(accum, curr, currI, O) {
        return accum - corrFactor * curr;
      }
      this._value = [value].reduce(cback, this._value * corrFactor) / corrFactor;
      return this;
    },

    multiply: function(value) {
      function cback(accum, curr, currI, O) {
        var corrFactor = correctionFactor(accum, curr);
        return (accum * corrFactor) * (curr * corrFactor) / (corrFactor * corrFactor);
      }
      this._value = [this._value, value].reduce(cback, 1);
      return this;
    },

    divide: function(value) {
      function cback(accum, curr, currI, O) {
        var corrFactor = correctionFactor(accum, curr);
        return (accum * corrFactor) / (curr * corrFactor);
      }
      this._value = [this._value, value].reduce(cback);
      return this;
    },

    difference: function(value) {
      return Math.abs(numeral(this._value).subtract(value).value());
    }

  };

  /************************************
   Exposing Numeral
   ************************************/

  // CommonJS module is defined
  if (hasModule) {
    module.exports = numeral;
  }

  /*global ender:false */
  if (typeof ender === 'undefined') {
    // here, `this` means `window` in the browser, or `global` on the server
    // add `numeral` as a global object via a string identifier,
    // for Closure Compiler 'advanced' mode
    this['numeral'] = numeral;
  }

  /*global define:false */
  if (typeof define === 'function' && define.amd) {
    define([], function() {
      return numeral;
    });
  }
}).call(this);
